As somebody who's only flown the ERJ, I'm going to go ahead and say I prefer the CRJ. Why? It has a real yoke! There's a reason that 99% (no, I'm not sure that's the actual number) of the world's airlines don't have a freakin' ram's-horn.
As far as ERJs being underpowered, I certainly won't say they're comparable to a 777. However, it's really easy to overspeed an LR when you're at cruise power, at any altitude.