Which would be more beneficial for me to rank 5 for Act 6?

I have only just become cavalier so I have a long way to go.

Comments

Anyone of them your skill is what matters

Omega if you run suicides. Warlock if you don't.

Omega or warlock if suicides, void if not.
Btw, if you don't have sabreman as synergy for omega and you're running suicides, then warlock.