I'm currently running 41/42cm drops with 55cm flared drops. I was previously using Ritchey Comp Beacon flared bars at 44cm and 59cm flared drops. The Ritchey bars were better navigating technical single track, but was less aero on the road. My current bars are definitely more road aero, but don't offer the same stability on the trail, but still very good. I think it really depends on the conditions you ride in and what your body feels comfortable using.