EMB yokes: I flew EMB120s for 3 years, loved the rams horn yoke, one of the things I actually do miss about the Brasilia. That and the radar. You could shoot down birds with the radar in the 120. From what the ERJ guys tell me, they changed the radar in the 135/145, I can tell you the CRJ radar is ok, but I'd trade it for the old non digital EMB120 radar.
Performance: On paper the CRJ200 will do .81 and FL410. I've been flying it for 2 1/2 yrs, been to FL410 once, during a ferry flight, took off very very light, still took us all day to get there. But it WAS cool

.81 isn't that uncommon during the winter if you're light, but .78 to .79 is more realistic. Still gets you on down the road though.
Climb performance: From what I can tell the ERJs can out climb us especially above the mid 20s
Cockpit: I've sat in the ERJ a few times, was a galactic improvement over the 120. CRJ is wider and a lot quieter, mostly (from my understanding) cause the ERJ uses the same windshield as the EMB120 but its going 100kts faster IAS.
I wouldn't trade my CRJ for an ERJ, but if I were faced with deciding between 2 jobs where 1 flew CRJs and 1 flew ERJs, I wouldn't let the airplane be a big factor. They're both good airplanes.
Note: As noted by another poster, this is strictly based on CRJ200. The -700 is a completely different animal.