Generally, people want tall bc of resale OR being devils advocate, bigger stride can = slower= average Ammy can actually get down the lines. Gasp, a smaller horse, Ammy Average may have to ride and adjust. Flame away.
I have both. A 15.3 mare that can walk the lines and jump 4 foot easily, most athletic horse I've owned. I also have a 16.2 mare, but stride, gave not jumped her over 3 foot yet (she's going on 5). Guess who everyone wants to buy? The blingy bigger one who does not have the athleticism (yet) of the plain bay. Both move to die for with good ribbons under saddle.