Zeta qgj or aayla

Depends on the rest of the squad, and how much tenacity you can get on you Jedi under aayla. Most would rather have zqgj though. Only Zeta qgj if you're going to use him in arena too, because the damage difference between him and aayla won't be a lot. Also, a single zylo can Solo P1 of the HAAT, so if you have one in your guild, you don't need to waste time on a Jedi squad if you aren't going to use them anywhere else.

I'm using zQGJ in P1, Foresight allows to avoid a lot of attacks except the basic of Grievious. But you have almost the same result with the offensive bonus of JKA in P1. So, don't waste a zeta on him if you don't plan to use Jedis outside AAT.