I used to own a gorgeous thick welsh pony only 12hh and he fit me perfectly. I then moved onto a 14.3hh quater horse, thick as well and very forward moving. I know the height doesn't really matter it's the barrel but... I also ride a 15.3hh TB, thinner than the QH. I also look fine on her as well. I can controll them all with ease.
With these results should I rather look for personality and experience of a horse rather than height? (I think I should, just curious of what others think)