When it comes to 14 versus 16 inch keep in mind while in your situation it may not matter but overall the 16inch MacBook pro's typically have better cooling than the 14in.
The MacBook Pro max or m# max builds are 95% more power than most people need even if you're trying to future proof.
The MacBook Pro or m# pro series are for those that 1. can afford it 2. want further future proof and 3. need more power but aren't rendering or doing large productions.
The MacBook Air is your entry level, web browsing, general every day laptop soon to be close to an iPad with the upcoming iPad os 26 update.
With all that being said, I have a MacBook Pro m3 max and love it though I know I don't use it to its fullest extent (short of maybe playing cyberpunk 2077). I may upgrade when the next MacBook Pro series comes out hopefully with OLED screen.