Not sure how I missed this thread but I prefer Summer, mainly because I always feel the cold really badly in Winter, plus Australian Winter is always really boring because we don't get snow or anything. Also, something about the sun rising really early makes me actually wake up and want to go get stuff done, whereas in Winter it's always dark and unmotivating, and then it starts raining so you can't do anything, or you have to walk in the wet or something.
Also beaches, summer holidays, Christmas and stuff is always nice. <3