Spotted drafts are shorter and stockier. Like someone else said, you have to factor in your riding ability. Sure, weight is weight, so a heavier rider should have a larger/stronger horse in general. But I have a friend who is similar height/weight as you and she is a very advanced rider with a very light seat. My 17hh narrow TB toats her around no problem, but struggled and tripped a lot with a similar-sized beginner rider. I'd go for a spotted draft, large (17hh+ warmblood), Percheron or Clydesdale.