Who are You Guys Using for the BattleWorld Day 2 Bonus Mission?

I saw all Gamma and naively jumped in with just the top 5 guys automatically recommended to me. Turned out it wasn't a freebie, at least not on Difficulty 9. I got some kills but Leader was wrecking me. So before I waste my other two attacks, I thought I'd consult you fine folk.

Who's good to bring to this, and what's a wise strat/ kill order?