I’m 5’9”, ALL leg, and not a short torso either.
My TB is 15.3, 16h on his tippy toes, but he’s built like a tank. Huge barrel, relatively long neck, just overall a big boy. I look fine on him in a jump saddle, though bareback my ankles and some calf hang under his belly. I imagine a dressage saddle would have the same effect.
My WB was 16.3 and also built like a tank, but with his short neck I almost look the same on him as I do on the shorter TB. I felt better on the WB though, because he was pretty uphill with his front end and kept me back in the saddle. The longer/lower neck of my TB make me want to get up in front of the motion a bit sometimes.
Basically, it’s more about the build than the stick height, like everyone else has said. I’m of the opinion though that you should buy what makes you happy - if you want a big chunky horse, buy the big chunky horse! I like a certain “type”, so when I’m shopping for myself I will pass on anything that doesn’t fit that type. Because I know I’ll wish I’d waited and found something that fits the picture in my head. (That said, I’m not chasing any specific competition goals, so I can care about color and build vs experience and training).