Apart from in Sheffield of course (where neither is successful), the red teams seem to be more successful than the blue (Man U vs Man C, Liv vs Eve, Ars vs Chel). In fact, other than Rangers but their unmentionable rivals don't play in red), it's hard to think of any top club side that plays in blue (Inter M perhaps but are AC more successful ?).
So who can name consistently successful club sides that play in blue ?