Drog all the way.
I bought a drog after hearing about how a horses head was in the way all the time. I also did a quest
https://everquest.allakhazam.com/db/quest.html?quest=2172 to get a bridle, kinda a test if you want a horse for level 20ish.
I encountered a bug in one zone, where my drog changed into a horse on zone in.. that decided it for me, horsie head was always in the way, no matter how cool it looked to be on a horse. Of course, I dont target with my mouse, but my screen has quite enough things on it to block my view.
Just my two CPs, since you asked.