@collin the biggest difference between them (if performance isn't an issue) is screen quality/brightness. The Pro's screen is significantly better than the Air’s.
@collin I’m in the same boat. For the first time in my life, the best chips on the market are above my needs by an order of magnitude. A base M4 can do everything I need. Just 10 years ago I needed the top Core intel series to do what I wanted. Crazy times we live in.