So I love X-Wing, been playing since the game came out, and I'll stick with it for a long time to come. I'll probably be sinking way more money into X-Wing than IA.
That said, the future of IA seems way more exciting.
We're going to be getting annoucments for Boba Fett and Princess Leia and endless cool expansions.
X-Wing's expansions at this point are more interesting than exciting. They've exhausted all of the recognizable ships, so while the new mechanics and stats and abilities are exciting, the ships themselves aren't.
Know what I mean?
When new stuff comes out for X-Wing I expect to be like. "Huh. That's interesting. Can't wait to see how that turns out."
With IA it'll be like "YEAH! Boba Fett finally! Woot!"