Return of Reckoning

Black Orks received a major overhaul since the Ability Rework happened.
Nowdays, for orvr, Sword and Board (SnB) BO is extremely valuable and I would argue for it being the best tank on Destro.
A bad Chosen will be more valuable than a bad BO player, but a good Black Ork will be way more ...

I'm trying to get back into the game after being out for over ten years...
Can anyone tell me which greenskin is best in their role?

Essentially I've read the BO is lest desirable tank, but I'm having difficulty finding info on which greenskin does their role best. It doesn't have to be the ...