Depends what what you want to prioritize, raids or arena.
QGJ is very good but he really needs GK to be able to rank high in arena. Otherwise he'll be relegated to only do GW. In AAT, I don't use him as leader neither, JKA or IGD fit better.
Darth Maul is good if you like Sith but since R2 has been released, he's losing rank.
Kylo is still useful, especially for hAAT P1. He can be a good add-on in your arena team also.
Maybe Sidious can fit better in your team with Vader's lead.