Just trial each one and see what works better for you.
In my opinion, Gladiator Suite is tailored specifically for PvPíng warriors so I'd go with that one.
For druids it depends on what spec you're going.
Resto? Go with Leaves.
Feral? Try Superbad.
If you're going to be changing between specs then go with TuanHA, they cover all 4. Buddy Store <-- Here's a link to the combat routines in the store, check out the features of each one.
Just a reminder, the PvP season is ending soon so make sure the routine you're buying will be optimised for 6.0 onwards
Also, might be better to post in the combat routines section in the future.