I'm currently debating this myself. I am running a base 13" MBA M1 that I will pass on to a family member. In terms of how I feel about it, I would like a larger screen (14" or 15" would be fine), and 8GB of RAM + 256GB of storage is starting to feel a tiny bit cramped. I can stay within those RAM confines by just closing out applications more aggressively, but with the storage, it's starting to become difficult with the content and files I'd like to keep locally on my machine.
So I'm looking at 16GB RAM + 512GB SSD configurations, and it seems like my options are:
13" M2 MacBook Air - $1499 (but no increase in screen size)
15" M2 MacBook Air - $1699
14" M2 Pro MacBook Pro - $1749 at a few places at the moment
To me, it's hard to justify anything other than the 14" Pro. Both the 15" Air and the 14" Pro check all of my boxes, but for $50, I get better screen (ProMotion is killer), more powerful CPU/GPU, more ports, etc.
The Air is called "more portable" but the difference is basically negligible weight-wise and footprint wise I think the 15" would actually be larger. At any rate, I don't highly value portability because I work from home and rarely take my machine out of the house. I'd get a 16" if I could afford the expense, frankly.
It seems the real choice for me is whether it's worth giving up the above-mentioned benefits of the 14" Pro and giving up the increased screen size for $250 by going with the 13" Air, and I'm not sure it is, given I would keep the Pro for a number of years if I chose that.
EDIT: I guess I could also consider a refurb 13" Air at $1279 as well, so that's a $470 difference between that and the 14" M2 Pro. Still don't think, over the lifetime of the device, that it's worth the concessions.