What game should I do a nuzlock for?

I have been playing pokemon about 8 of my 18 years in existence, and I still have not done a nuzlock. I have played every main series pokemon game (except Sw/Sh, thats happening in a week or so) and after alot of thinking, I have narrowed it down to this: going back to my roots with black/white, revisiting ultra sun and moon, or playing Oras. Which should I do a nuzlock on? Any help would be appreciated but please understand before arguing with others below that everyone has their own oppinions. You are awesome for reading this far and thanks ahead of time.