I don't care what I actually fly, as others have said, whatever pays the most or gives the best QOL. But whatever you end up flying, chances are you will end up deadheading frequently in the back. As far as pax comfort, e170, e145, crj2, crj7, crj9 in that order. Having to wait in the crammed jetway with 70 other people for your bag is for the birds. Also I'm not a fan of the negative pitch of the seats while taxiing in to crj7/9. The single seat to yourself on the e145s are underrated.