So I skipped Gen V and I'm thinking of going back and playing it, maybe a Nuzlocke run or something

what I want to know is if it's worth playing both B/W and B2/W2, or if I would be fine just playing the latter. It's my understanding that they both take place in the same region, so I'm thinking that maybe the two games aren't different enough to merit playing through both of them if I don't care about the story (which I don't)