I'm not really a fan of extremes in either direction, but I suppose I have more experience in dealing with the heat, so if I had to choose one, it would probably be that. That said, a dry heat is much easier to deal with than relentless humidity that lasts for months on end (I know that from experience too).

It's also worth noting that everything's relative. There's a good chance I've never experienced anything that would be considered extreme cold by some in this thread. The town I grew up in has had something like three snowfalls since 1965. And the place I live in now hasn't had snow since the last ice age, and probably not even then.