I'm partial to Arabs. They get a bad rap, but are just a bit more sensitive than other breeds. My experience is that they seem to really bond with their owners, are loyal, can go all day (and then some), learn quickly and try their best to please.
I've had QHs, too. Good solid horses, most are very even keeled and athletic.
The other breeds you mentioned....no clue. But I'm sure they have just as good or better qualities!