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It would need to be an unbelievably good deal. Don't forget that the first-gen Retina MacBook Pros have display coating issues and they're not covered under the replacement program anymore. Replacing the battery isn't easy either.
2015 15" MacBook Pros have fourth-gen quad-core i7s that perform worse than newer base 13" MacBooks. As mentioned above, I'd look for an M1 MBA.
 
It would need to be an unbelievably good deal. Don't forget that the first-gen Retina MacBook Pros have display coating issues and they're not covered under the replacement program anymore. Replacing the battery isn't easy either.
2015 15" MacBook Pros have fourth-gen quad-core i7s that perform worse than newer base 13" MacBooks. As mentioned above, I'd look for an M1 MBA.
I have a buying dilemma lol. There's an offer, 680ish dollars for the 2015 15 MBP, and 800 dollars for the M1 base model but because the owner dented the side, she was selling it cheaper.
 
Don't buy anything dented or damaged.

I wouldn't buy ANY MacBook with a butterfly keyboard. These are going to cost you money down the line.

If you need an intel-based MB now, I'd suggest the 2020 design MacBook Pro 13", Apple-refurbished.
It has the re-designed version of the scissors keyboard (now called the "magic" keyboard).
New enough to remain functional for years, at a decent price.
 
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I have a buying dilemma lol. There's an offer, 680ish dollars for the 2015 15 MBP, and 800 dollars for the M1 base model but because the owner dented the side, she was selling it cheaper.
I agree with @Fishrrman - dented/damaged is a gamble. Ask yourself this - if it's perfectly fine then why would she be selling it?

Not knowing the prices of the used market in your corner of the world I can't advise on the pricing of the 2015 MBP15 but it seems like a lot of money for a six year old computer on a CPU that Apple is quickly moving away from.

I'd suggest finding why your current 2013 model is slowing and address that issue, then wait the few months until the next round of Apple Silicon systems comes out and perhaps buy the 16" model at that time. I wouldn't buy a butterfly keyboard equipped Intel MBP16 - the new keyboards are so much better.
 
I have a buying dilemma lol. There's an offer, 680ish dollars for the 2015 15 MBP, and 800 dollars for the M1 base model but because the owner dented the side, she was selling it cheaper.

I have a 2015 rMBP i7/16g ram/500g ssd - works great on Big Sur

If you are considering the 2015rMBP, I would make sure it is the i7 processor, has 16g mem (cannot be upgraded later), has 500g storage? (can be easily upgraded)

If the storage needs to be upgraded or the battery is due for replacement - which it probably is - you might consider those costs
 
I agree with @Fishrrman - dented/damaged is a gamble. Ask yourself this - if it's perfectly fine then why would she be selling it?

Not knowing the prices of the used market in your corner of the world I can't advise on the pricing of the 2015 MBP15 but it seems like a lot of money for a six year old computer on a CPU that Apple is quickly moving away from.

I'd suggest finding why your current 2013 model is slowing and address that issue, then wait the few months until the next round of Apple Silicon systems comes out and perhaps buy the 16" model at that time. I wouldn't buy a butterfly keyboard equipped Intel MBP16 - the new keyboards are so much better.

After watching some videos and reading, I think im definitely leaning more to the M1 series, which blows everything out of the water and with superb power efficiency. And USB C accessories are getting cheaper as well..
 
After watching some videos and reading, I think im definitely leaning more to the M1 series, which blows everything out of the water and with superb power efficiency. And USB C accessories are getting cheaper as well..
I have been very happy with my M1 MBP. It's silent to my ears and remains FAR cooler in my lap than any Intel MacBook I've owned. For me the 13.3" display is fine; frankly my 2018 MBP15 was kinda big and clunky. At my desk I'm using a 27" 1440p display anyway so I like the smaller size for sitting on the sofa.

USBC connectors are readily available for stuff. You may be able to simply and inexpensively replace the cables on existing accessories like external drives and such. Or stick an adapter on the end of the cable. Most of the angst I see from folks about dongles and such is from just not biting the bullet and migrating their stuff over.

Also note that with the newer USBC charging systems you can supplement the battery with a USBC power bank.

The questions you need to ask are whether you have a dependency on Intel - such as needing Windows / Bootcamp, and whether you're dependent on old software that's not updated for Big Sur. If so then you may be better of to limp along with your current system and/or buy an early 2020 Intel MBP13. Also think well on whether you'd be okay with 13.3" display or if you need to wait for a 16" model to be released.
 
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Trade in is mostly less than selling on places like eBay. If you could get as much as on eBay through trade-in no one would bother with eBay.
Pretty sure apple won't even take a 2015 for trade in. If they do I say they give you $50.
 
900 USD, is it too much? Problem is I don’t want to go to the butterfly keyboaed series..
My 5 cents on a butterfly keyboard :

I know its not a popular opinion, but I never had problems with butterfly keyboards and I liked them.
And I've typed a lot of code and text. I now use 5th gen. MacBook Pro with a scissor mechanism keyboard and sometimes I miss butterfly keyboard.

With that said, I would not be buying any intel based Mac now.
 
Made up my mind and got a second hand MBA M1 with just 5 battery cycles on it at 867 USD off the second hand market in my country (Singapore). Couldn't be more happy with it, very snappy performance, even on apps still running x86.
Congrats, you have a lovely new computer with a great screen.

I have a 2015 15" MBP as my main computer, and I love it, but no way is it worth $900 now. Probably have to go down to $300-$400 to make me look again. It was a good upgrade over my 2013 MBA as I needed the bigger & better screen, and I replaced the SSD on both computers with modern NVMe SSDs to make them both much faster.

Will probably sell them soon to get the 2nd gen M2 15" MPB as and when it comes out - if the price is not too exorbitant.
 
Made up my mind and got a second hand MBA M1 with just 5 battery cycles on it at 867 USD off the second hand market in my country (Singapore). Couldn't be more happy with it, very snappy performance, even on apps still running x86.

Good choice.
 
Deals can be found for an Early 2015 MacBook Pro depending on condition and size of the laptop. I recently picked up a 13-inch 2015 rMBP for $160 on eBay. Laptop had some issues (faulty logic board) which was very easy to repair since I had a spare logic board on hand from another project I completed earlier this year. So if you're handy repairing these laptops which are very easy to repair, then you can source a decent one for cheap and then restore it as you want.
 
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