More room. The headroom on an ERJ-135 is like walking though a piece of drain tile - not bad if you are short, but it sucks for those over 6'. The pitch is the same at 31", but the width is 19" vs 17.3. Unfortunately, YMMV, as there are several variants of the Dash-8; even one with 'first class' (not on this route that I know of). Note that I did state on shorter routes - such as PIT-CLE or similar as these things are s-l-o-w (a bit over 300mph vs a bit over 500mph typical cruise speed).