I have an M1 MBA with 512GB storage and 16GB RAM. It's been great for me. However, the battery capacity is now in the mid-80% area. It still has a decent trade-in value so I began eyeing the 15" MBA. The bigger screen and better specs looked attractive as I will be using it when I travel away from my home setup. To bring it up to 512GB storage and 16GB RAM, though, I would need to add $400. I was debating whether it was worth it as it doesn't seem to a big enough step to plunk down $$ and there were strong rumors of the M3's imminent release. With the 15" MBA being introduced just last August, I'm think that it would be about a year behind "state of the art" and a loss of a year of being supported.
Then the M3 MBPs were announced. Going to an M3, aside from yet more improvements over the M1, extends being supported further. I looked at the MBP M3 but for $200 more after upgrading RAM to 16GB, there's the MBP M3 Pro already with 18GB RAM and 512GB storage. Moreover, it has that third USB-C port on the right side and an HDMI port as well as an SD slot. Also, of course, better screen and audio specs. It supports two external monitors and comes in Space Black
. I'm also planning to do more software development so the added horsepower would be welcome.
Bottom line: I have decided to trade my M1 MBA for an M3 Pro MBP.