I'd prefer the heat. I was trying to do some astronomical photography this past winter (meteor shower and later PANSTARRS comet). I was standing outside for a long time for each of these. While it's true I can just bundle up, I can't change all the settings on my camera if I have gloves on. I prefer to work with my bare hands when it comes to my camera. I was fine for the first few minutes, but after that, it just became annoying to do. In the heat, I may sweat to no end, but at least my hands won't freeze when I need to make adjustments.