A year ago when I bought my 15-in M3 MacBook Air it was A$400 cheaper than the 14-in M3 MacBook Pro with the same specifications.
It's a different story now with the M4 versions of both. The difference between the 15-in Air and 14-in Pro with the same SoC specifications is a mere A$100. If I were looking to replace my (previous) base model M1 MacBook Air with an M4 laptop I'd definitely specify the Pro.