In general, I would have to say coldbloods. The Bashkir Curlies are my favorite breed and majority wise they are a cold blooded breed. My gelding is the exact spitting image of that (although, lol he does have his spastic BLAHHHH moments :) ) But, I don't mind having a hotblooded horse. My other horse is a Arab X Bashkir Curly and she can go go go all day. On a scale of one to ten, one being the coldest horse out there she is about a seven or a eight. But, yeah, in general I would have to say coldbloods would win my vote.