would you be upgrading storage on the 15in mba too? if so then the air would definitely be plenty of computer for you ! i definitely don't recommend going 15in Air w/ base 256gb storage
however, the 14in pro would obviously be an even bigger beast of a laptop & if you can swing it would be the best buy unless you really value having a bigger screen. But keep in mind the 14in pros screen may not be as big but is a whole lot better so..
the 15in Air 16gb/512gb would 100% be great though, could even get a cooling pad if worried about being hot in your room !