Um… I can tell you classes that are good in M+, but idk about raiding.
Outlaw Rogue, Demon Hunter, Fire Mage, Unholy DK, BM Hunter, Prot Warrior, Brewmaster Monk… umm Resto Druid… I am sure there are more.
Granted, all classes play well in M+, but those guys are pretty strong. I guess, maybe?..