I am 5'5" and 115 lbs. My current horses are 14hh and 14'2hh. Previously I have owned and ridden horses up to 16hh, but I always felt like they were too big. People told me I looked like a monkey on their backs.
My husband is 6'3" around 200lbs and competes on a 14'1hh mare, they do just fine together.
To me it seems in the Western world it is more acceptable to ride smaller horses. My niece is a show jumper and one of her top horses is considered very small at 15'3hh.
Us western people like our horses short because we are often getting on and off of them. (steer doggin, roping, doctoring, branding, calving) Makes it a bit easier if their shorter.
I'm about 5'7 and my mare is somewhere around 15 hands ( I have never measured) but I consider her to big for my liking.Although I do like her cause she's an easy ride. I don't like getting on her cause she's to dang tall for me to be haulin my big butt on to. I also think she mkight be 1/4 draft cause her legs are so thick and hairy. Especialy for an appy.