The TIE Interceptor really would've been farther from the TIE. It's an arc-dodger extraordinaire, while at this point the Advanced is kinda just an expensive TIE with shields. Vader is, of course, a big exception. On the other hand, with limited upgrades you wouldn't be able to make the best use of the Interceptor yet anyway.
For the Rebels, you're right that the A-Wing's dial will make it fly much differently, though again it depends on your upgrades to make it worthwhile. The B-Wing is kinda a slightly better X-Wing. Mostly it's the 3 shields for 1 point more, but the dial, which is supposed to be a liability, is superior in some ways. Y-Wings can use turrets, which will fly a little differently.
