If you're excited at all about hockey fights, do it on that. You'll find a lot more readily available quantitative data on hockey fights, which should be the majority of your report. To go the skiing route, you'd need to interview various ski comp organizers, judges, and iconic filmmakers because there just isn't very much info out there, and this doesn't sound like a project that will reward subjectivity very highly.
Plus, you'll probably hate this project after a few months, and you don't want to hate skiing.