try to look for any deals on the 13 but if you can’t then go for a 12. My reasons is because of magsafe and longevity

I only use magsafe cause I messed up my lightning port but I’d probably be using wired more. magsafe is still good tho

as for chargers get anker they’re cheaper than Apple for the same amount of watts as apples and they’re smaller. or their 30W bricks are the same price as apples 20W brick