Please go with M2 one… The price difference is so few and it will worth.

Don’t worry. If you don’t dry it you may have rust issue. It’s mostly fixable with ultrasound cleaner but better you must go to a repair store and let them clean and dry your MacBook’s inside or you can do it yourself if you are aware of what you’re doing.

It doesn’t have any opponent. It’s good for listening music too.

MBP 16". Idk if they made speaker improvements with M3s but M2 ones are uniquely the best.