Joined: Jan 2009
Posts: 6,643
Likes: 2,368
From: Colorado Springs, CO
Bikes: 2015 Charge Plug, 2007 Dahon Boardwalk, 1997 Specialized Rockhopper, 1984 Nishiki International, 2006 Felt F65, 1989 Dahon Getaway V
My two (okay,25 cents). If you are going to ride in traffic, as in commuting, then choose the light that has better side visibility. I prefer multi-LED lights with at least one "bulb" pointing off to each side. The next best set-up is to have a "deep" enough red plastic cowl to glow when seen from the sides.
If it's a question of esthetics, then it depends on how the bike looks, or the visual theme of the bike.