I've got both, have ridden centuries on both, and have logged thousands of miles on both. As far as comfort it is a toss-up. I find a slight advantage in the drop bars for sprints and hill climbs on spirited group rides, otherwise no big difference.
+2 on the Ergon bar ends. I've got them on both my gravel grinder and my MTB and my wife and daughter have them on their commuters. The additional hand positions really help prevent hand fatigue and can add control on rough roads. I spend 90% of my time on the road bike with my hands on the hoods. The Ergon bar ends give me a very similar hand position.
Last edited by GravelMN; 03-09-15 at 08:44 PM.