Hot water from start to finish all year round. It just feels so much better. Anything cold first thing in the morning is not pleasant.
I was a fan of hot water until I discovered cold. Pre-shave always hot but then either warm either cold.
It's been so hot here in CA that I've done cold water shaves a few times recently and it's really nice. I prefer warm water, not too hot, but a cold water shave has its place in my rotation.