Here is another thought...
I'm barely 5'1" on a fluffy hair day. I have ridden 12 to 18 hands and like others mention, it is more about the fit than looks, as I'm sure I looked like a 6 year old on the big Warmblood I rode but we worked well together.
But, you also have to GROOM, tack, and take care of that horse too.
I like them tall as much as the next, but having to stand on a bucket or step stool to brush their backs, then move the stool to reach their rump, then move the stool to reach their necks, or move the stool to do routine things isn't near as easy as keeping your feet on the ground.
Plus, as I have aged I've learned that I don't bounce as well anymore.
It may be worth considering how the size might affect the other aspects.