Summoners if you've got the MP regen equips
F.Mechs do well too, Corona is ridiculous
Crusaders are very self sufficient
Grapplers don't really have a difficulty with anything, except MP problems
I'd say your best bet is Summoners, although they can be slow. If you'd like to clear faster but at the expense of more difficulty, grapplers or mechs. Saders are my last choice as they don't have as much DPS as the other 3.
Considering this is all PvE.