When AN was evaluating the CRJ and ERJ for their KD subsidiary they carried out extensive reviews with their major regional customers even to the point of having demo aircraft flown to Australian regional ports and having clients climb all over the plane.
After extensive evaluation they chose the CRJ but admit that the competition was extremely close. In the end one of the major points in favor of the CRJ was the perception of customers that its 2X2 configuration made it seem more of a real plane than the 2X1 of the ERJ which reminded customers of regional props such as the Saab 340.
The jetway abilities of the ERJ was of limited value as typically the CRJ flies to smaller airports that do not operate jetways. When visiting larger airports such as MEL etc, KD use a snake-like device which creeps out to the plane and creates a completely covered way between the plane and the terminal. This device is only used on days when the weather is poor.
I find the CRJ very comfortable but note that KD are consistently advising pax to take care when standing up due to the fairly low cabin height above the seats. I have only ever hit my head once.