The E145 (non-XR) will outclimb a CRJ-200 at altitude but my experience on the jumpseat of the 145 and flying the CRJ says the taco rocket ain't faster than a CRJ once you get it on the step in cruise.

As a passenger I prefer the CRJ because of overhead bins on both sides (easier to get a PNT bag in), 2x2 seating and it is a bit quieter. I think I'm an exception though because I hate the single-seat side of the EMBs because of how the fuselage rolls under, taking away legroom. As a jumpseater I prefer the CRJ because it has a bigger cockpit than the ERJ, but its only marginally better. I'm thankful the CRJ-200 doesn't have XR range, because I couldn't handle 4 hour segments in such a small cockpit or cabin. The 145 does land like a real airplane though, instead of the dive-bomb approach in the CR2.

They are both cheap jets that are fairly reliable means of hauling ~50 back and forth. One is not any better than the other...