Production issues aside (which I assume Apple has fixed by now), the Air has an empirically lower quality screen compared to the Pro. The screen on the Air is 60 Hz vs 120 Hz on the Pro. The Pro screen can also display HDR content while the Air screen cannot. On the processor side, the Air will have a slower chip that is passively cooled (no fan). So it will be slower in normal use and may throttle under heavy load compared to the Pro. That being said, the M2 chip in the Air is more than fast enough for regular computing tasks (web, email, spreadsheets, etc). The Pro will have more ports, bigger battery, and more upgrade options at purchase. But, it will also be heavier than the Air.
Bottom line: if you value sustained performance and/or having the nicest screen and don’t mind a heavier computer and spending more, get the Pro. If you value having the lightest and thinnest computer of its size class, get the 15” Air when it’s announced. It will still be a good machine for many tasks and you’ll save money over the Pro.