I would recommend importing it, as that's exactly what I did once I beat EBA. The games are pretty comparable. OTO has better music IMO, but they're both about equal otherwise. EBA has harder patterns, but OTO has harder spinners and the bar drops faster, so the difficulty is about even(I do think EBA is harder though, as I find it much easier to get S Ranks in OTO than in EBA). The story/characters are about even also, though I prefer the Agents just because the crazy dancing is just so entertaining.
EBA has better features, being newer of course. High scores are only displayed in the options menu, you can't skip song openings, you can't skip the credits, there's no unlockable songs(and no bonus for completeing the hardest level) , and you can't save replays. While all these things are missed, in the end they're just minor details, and I can't imagine anyone not liking either one of these games(unless they really, really hate music games).