Ability block/expose and TM gains, but also pure speed vs the other cap ship. 90% of my matches are done before either ultimate and I win 90% of my matches.
Here's a trick for you. Open with TF special to get foresight. You lose a chance at TL but that's ok because you'll get it with Vader. Then your cap ship goes first, you use AOE. Doesn't matter if enemy TIE dodges because their cap ship would be going next anyway. Their cap ship uses AOE, your TF dodges. If your Executrix is fast enough, it will take another turn immediately, so you now have four ships out. I use Phantom, which can usually finish off the other Biggs with its special plus bonuses, so now it's 4 vs 2. And on my next Executrix turn I reinforce again, so it's 5 on 3, or 5 on 2, or even 5 on 1.
It doesn't work every time. But most of the time it does.