EBA feels like an actual sequel. It's got a slightly improved interface and better patterns on the higher difficulties. I found that the songs grew on me quickly and that the scenarios were mostly ok, with a few being really, really good; exactly the same ratio as the Japanese one. Unfortunately, I took too long a break between that and Ouendan 2 so I lost my mad skills. I didn't put enough time into it to judge it.
My favorites are the little girl whose father died (I know it sounds mean but the failures are shockingly hilarious for the subject matter) and the "You bet, kid!" baseball guy.