Zeta Decision

Alright, off that bat I already know this squad is probably going to be laughed at for being trash, but I like it for GW and so far it's been working for me fantastically. The squad is Zeta Jyn lead, R2, Chirrut, ATF, and Old Ben. I swap out Old Ben for Baze from time to time depending on the opponent but for the most part I use Old Ben. My question is: I have three zetas to choose from for this line up, both of R2's and ATF's Whirlwind. Out of these three, which would be the best for this squad to potentially make it arena viable or even just more GW viable. I like these toons and for the past month they have been able to reliably clear my GW only running into problems on the super whale squad in node 10&11.