Upgrade from 2019 MBP 13 Core i5

Has anyone here upgraded from a 2019 Macbook Pro 13 inch Core i5 to MBA M4 15 inch? Im confused if getting the Pro 16 inch has any advantage now.

I plan to use it for C++ coding in XCode. I recently started learning about AI/LLM stuff and was wondering if getting the Pro 16 inch has any advantage for that purpose.

I also worry that overtime there may be problems with battery heating up while charging and having the fans could help in such a case.

My budget is to stay below $2500.