Narrowing down my buying decision. Going to get a 13.3" Macbook Pro (the price is the deciding factor) and trying to decide between 128 GB SSD of 256 SSD. I will be using the laptop for basic everyday tasks - email, websurfing, some minor photo and video editing, some minor CAD design. I think I will go with 16GB RAM to kind of future proof the laptop but am wondering what SSD would work knowing I could always add an external SSD if I need it. Also, what difference is there between a 1.4 GHZ I5 chip and a 2.4 GHZ i5 chip? Is it worth to by the 2.4 GHZ? Thanks for your help.
Storage
Keep in mind that the macOS system is going to use about ~20GB storage.
I have a 2019 MacBook Air with 8GB RAM and 128GB SSD. I currently have 93.37GB storage left with the following installed:
* macOS Catalina system
* Affinity Designer
* Affinity Photo
* GIMP
* iMovie
* Numbers
* Onyx
* Pages
I don't see any issues with only 8GB RAM, but don't know what the future holds as far as RAM needs. I'm not sure how much storage your CAD app will take, so that should figure in as well.
CPU
Keep in mind that the T2 chip takes a lot of work off the CPU, so a T2-equipped machine will perform better than the specs would suggest. My 2019 MBA doesn't have any issues with lag, freezes or beach balling. I typically have ~7 apps open with 5 tabs in Safari.
I hope this information can be of help to you. If I had it to do over again, I would probably go with 256GB SSD if only for peace of mind.