hmm....I have such mixed feelings about these. I played R6V1 for probably 2 years before finally getting R6V2. I finished the single player stuff, but played split-screen T-Hunt endlessly.
So, I finally got R6V2 and was somewhat disappointed...but not too terribly bad. The single player is fine, but not why I bought it. I bought it for the split-screen T-hunt of course. I feel the maps are sub-par, when compared to R6V1, but they added the ability to earn XP while playing split-screen T-hunt. This makes it really addicting and has kept me playing it over R6V1.
I just wish I could get all of the maps from R6V1 on R6V2. I loved those maps so much, but earning XP on R6V2 makes it feel like you're actually accomplishing something by playing the same thing repeatedly.
Also, I wasn't able to find any new maps to download other than the "Gift Pack" (on 360). Any help here?
Sorry for being long-winded. My point is, I'd recommend them both and I don't think it would matter what order you played them in.