I prefer flat bars for the majority of bikes that I own. In fact, out of 10 bikes total, five tandems and five single bikes, only two are drop-bar: one tandem and one single. The commuters are flat bar, the cargo, flat bar, urban cruiser flat-bar. Flat bar position and drop bar position are very different even on the same frame. People THINK they have the same back angle after a conversion and nothing could be further from the truth. And that's a good thing actually. When you want that lower profile that is better for aerodynamic efficiency, a drop bar is about the best way to accomplish it.

Conversion TO drop bars involves considerable expense in the age of brifters and high (>8) count cassettes. A conversion to flat bars in the age of MTB/ROAD bifurcation involves the waste of perfectly good components that will not play nice in the MTB paradigm. TL;DR: N+1 FTW.