Joined: Feb 2006
Posts: 12,286
Likes: 317
From: Lake Geneva, WI
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
I have two vintage Road bikes with a horizontal top-tube and two modern Road bikes with a sloping top-tube.
I find that the modern bikes fit better. I like a longer top-tube in proportion to the seat tube and need a virtual top-tube length of 59 to 60cm. I also like having a taller head-tube length. Most bikes with level top-tubes have short (for me) top-tubes in proportion to the rest of the bike.
I base my selection on fit, not appearance.