Tie Interceptor to this date!

When or if Tie Defender / Tie Avenger arrives, that one!!

Is there a physical (we can see it) difference between the Avenger and the Advanced Interceptor? [Edited above]

Yep it's closer in looks to the X1, It has a bigger center area behind the cockpit than the TIE/In. The wings are also closer in shape to a X1 with bits cut out, the wings on the Interceptor are more tear shaped and sleak.

The X1 is really a concept craft, the Avenger is the production model after all the kinks are worked out and they can get the shields to work properly.