the real significant difference is that the overhead bins in the CR9 are somewhat smaller than those on mainline jets, and are ONLY installed on the right side of the cabin
you will also generally have to gate-check a standard size rollaboard bag and reclaim it planeside at ONT
personally, I'd pay the extra $50-60 to fly DL F over WN any day
as to SkyClub access, see
this thread for the latest