if i can snag an exit/bulkhead row, i find the CR2's to be better because they're a wider plane. the E145 is such a narrow plane that whenever i'm stuck on a window seat, i find that the curvature of the fuselage is so tight that my legs always feel cramped, and especially on a longer flight that feeling starts to grow into frustration.
but i hate both. i'm sure that both planes were designed by someone who hates humans. i haven't flown the CR9 yet, but i've been on the UA CR7's and i've gotten EUA'd every time. they're not that bad in my opinion. and if i start to feel uncomfortable on that plane, i just keep asking for more gin and tonics until i stop feeling uncomfortable and pass out.