I'd rather be on an E170 or E190 as there's no middle seat. The seat width and pitch as as good as a 737 and the baggage bins seem to fit my carry-on OK. I have no problem at all on these.

The E135/145 are also fine for me providing:

1) I get an A seat or an aisle seat
2) They have a planeside valet service for carry-ons

95% of the time I get the seat I want and all the European operators seem to offer valet service for the carry-ons. So, much less stress to get on early and secure a place for the carry-on!

However, I will not fly a CRJ - far too small.