its not the size that matters its the speed and heart put into that package that counts, give me a small horse over the huge ones anyday (one because they are normally more in my price range at the sales lol) but also because there is so much less impact on legs with a smaller horse, they often handle a turn much better and me being short I cant get a jolly bridle on the giants (yep have had to sit/stand on the tie up rail to get the bridle on a couple of not so cooperative ponies come raceday lol) have always had a lot more luck with the little ones than the bigger horses and find the smaller types often have more blistering speed than the big guys that need time to get it all together.
But each to their own I just wish I had one that could run 1.53 big or small