I had a really enjoyable and memorable high school, especially because I was an athlete, but I would say college because so much more freedom. I can pick and choose my schedule, what I do at nights, when I study, when I GO to class, and whatnot, feels more like my life, but high school was a great time for me too.
However, I would say college is much harder, and can be way more stressful at times. But maybe that's because I constantly took 18 credits a semester and was on a pre-med track, most people won't be as stupid as me lol.