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Honestly, neither.
Now, allow me to explain this. I feel that BW2 had way more content than their original counterparts. However, I wasn't a fan of the fact that Team Plasma decided to fuck all and come back two years after being beaten. It makes it feel like the efforts of the previous protagonists went in vain.
In regards to making a third version, I've never been a fan of this. At least, not while the original two versions are still relevant. The whole point of Pokemon games is for you to get out and go trade/battle/etc with friends and whatnot. And I can get that not everyone has friends who play, and that's why we have wifi stuff these days. And before someone says "Oh, but not everyone has wifi.", I get that. However, as we get closer to 2014, there's no reason to not have wifi.
Bottomline, sequels can make the originals feel like total shit and third versions are pointless because they hand you everything on a silver platter, sometimes in a nonsensical manner.