Cold definitely for me - I love snuggling under the weight of a couple of thick duvets, and the long nights mean less noisy, irritating people around.
Hot weather turns me into a slug, it just sucks away all my energy. I hate when even with no clothes and no bedding it is still too hot to sleep. And I hate most of all having hot feet! - having to keep them festering away inside shoes or boots in the hot weather drives me to distraction - why are sandals (or shorts for that matter) for men only deemed appropriate for the beach? Maybe that's just a British thing, I don't know, but it seems ridiculous to me.
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When you are fighting an invisible monster, first throw a bucket of paint over it.