Just a quick point: If a flight is going to be full (like so many are these days), I'd rather sit in an RJ. Why?
Because in the RJ I am not going to be forced to sit in the dreaded middle seat in the back of a 150-passenger airplane. You always get either a window or an aisle (or both) in an RJ. There is no worse place to be than stuck in a middle seat for a couple of hours while both your seatmates take both armrests. The pax in front of you has his seat reclined right into your face. The guy on the aisle rolls his eyes when you need to get up to use the lav. The guy at the window slams his shade shut the second he sits down and does not open it until after the plane lands (is he afraid of sunlight - a vampire maybe.)
I'm not going to have to walk up and down the aisle trying to find a space for my rollerbag in the crammed overhead bins while the "friendly" FA's are on the PA telling everyone that they have to sit down so we can push (on the RJ it'll be dropped off at the door and waiting for me when I get off - no fuss, no muss).
In the Embraer, at least, the lav is as big as any mainliner lav since it spans the entire width of the cabin. So what's the complaint about the lav? On another note, because the airplane is much smaller, the FA usually has his or her service done quickly. Therefore the aisle isn't blocked for a half-hour or more by the galley cart, totally preventing any passenger movement to or from the lavs, as happens frequently on the larger mainline jets.
I agree that if the flight is somewhat less than full, I'd rather ride on a full size jet. No RJ can match first class on a mainline jet, especially a widebody. But how many pax ever ride in first class, anyway? First class is taken by the same relatively small demographic – a few businessmen or women cashing in some miles. The rest of the businessmen and women who were not lucky enough to snag one of the few first class seats get to sit in the back of the bus like the rest of us. Oh, but wait! They DO get one more inch of seat pitch! Woo hoo!
