After I coded some games I want to build my own console with a raspberry pi. Question is:
since most of my games are built with the _update60 function, what pi should i buy to run the games smooth?

Also, I would like to know when I should be using the _update60 vs the _update30.

Thanks in advance.

well I can tell you 60 FPS carts run flawlessly on my Raspberry Pi 3 Model B, if that helps.

before I got that one, I only had an old original model B from like 2012 and it couldn't keep up with 60 FPS carts.