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The brands I mentioned are all quite good. There's no point going with a maker's performance line so I would look at the Samsung 860 Evo, Kingston A400, Adata SU650, or Crucial MX500.

Given the age of the MacBook, I would choose the cheapest I could find. I don't worry about whether the drive uses QLC, TLC, SLC, or MLC memory because the drive will probably last longer than the MacBook.
 
As Audit13 said above, look for any SATA3 2.5" SSD from the companies above. I fitted a Crucial MX300 in my 2011 and it worked really well. Their current equivalent of this is the MX500. Avoid other form factors and more modern technologies like M2, NvME.
 
"What drive will give me max performance without me spending extra on specs that wont be overkill for this old dog?"

Just about any SSD will do.
I recommend that you DO NOT pay extra for the "latest and greatest".

Get a Crucial, Sandisk, or even a generic drive.
They'll do fine.
 
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