my experience is long top tubes and short stems make the handelbars flop especially on steep uphills. I like having a bit longer stem 110mm ( I am 71" tall with a 33.5" inseam) rather than being able to "roost" my tush over the rear wheel on the downhill. That said, some people really like longer top tubes. It comes down to personal choice, ride one and find out for yourself.

VTW