I'm not so good at skateboarding, if I had to use additional instability through hovering I think I'd suck. So I'd go with the hovercar. Could also be strong enough to hover a few meters above ground
The car, because I can't ride a skateboard. Cars are cooler. You sit down, ride up to girls all smoothly, and say, "Hey girl, need a ride?". Then I'd fly away... Smoothly...
Does anyone play Jak&Daxter? This game has both. Jetboard and Zoomers/Flyers. I love to play on the jetboard but I would personally fail if I'd try for real..