I thought RSG wasn't bad at all on Normal. Then again, I didn't play Ouendan until I had already mastered EBA, so that's part of it. Now, it was the first song in the game that didn't get through on the first try, but it only took me 3 to get past it.
If it weren't for the spinners, RSG wouldn't be hard at all on Hard either. It did take me about 10 tries or so to get through it, and as much as I like the song and that level, the spinners make me not want to play that one. Not the spot with 3 in a row, that's easy because you can just keep spinning, but the ones earlier in the song.
I will say I'm not looking forward to trying to get through RSG with the girls though, because I know it'll take some work to get through that.
EDIT:
Yeah, I made it to RSG on Very Hard now. And actually, the spinners aren't the problem, it's the beats being so small and so close together. But I'll just have to keep working at it.
I do think that Very Hard is better in Ouendan than it is in EBA, if only because the patterns are altered from time to time in OTO. In EBA, it's always just a faster mirror image of Hard. When I got to the last section of Shanghai Honey in Very Hard, I was freaking out since I know that level on Hard better than any of them.
Still, EBA is the harder game of the two. Some of the songs in OTO are just too easy. I've never missed more than 2 beats total on Over the Distance on any difficulty level(even my first try at this level on Very Hard only got me 2 misses), and that's just not right. It's still a fun level, but it's not very challenging. I mean, I had that one S ranked on Hard after only owning the game for 2 days.