Code is not all over the place. it can only be in frames aND EXTERNAL .AS FILES. Good organization. more flexible, you can have 1 function handling many events for example
Yeah, AS3 runs significantly faster when handling multiple events. It also runs slightly faster in particular. If you want to make a BIG BIG game, AS3 would be the best bet. But if you're used to using AS2, you might as well stick with it, as AS3 takes a long time to get used to...