The E175 feels *much* better inside than a 737. Y vs Y and F vs F - both have a roomier feel on the E175. (F because you can get a single seat that is both aisle and window. Y because it's 2x2 instead of 3x3.)

While the jet itself is a little smaller, it is a better passenger experience all around. If you have the option to buy F on a 175, do it - no hesitation.

Complaints on these fora about "regional jets" are mostly about the Embraer 135 and 145, as well as the Canadair jets like the 200. The E175-190 series is quite nice. It's become my favorite short-haul type, really.