Nothing beats a nice glass of freshly squeezed orange juice. Sodas are good and I do drink 7Up almost everyday (highly unhealthy, but what can I say? I'm weak :P), but in my opinion fresh, pure (no sugar and other additives) home-made juice is the the way to go. Plus it's healthy; it's a win-win.
I prefer fruit juice, just because the fizz in the soda tingles my mouth which irritates me slightly. :3 It also doesn't taste as good and fruit juice is more refreshing.
I typically prefer soda, because it tends to give me a cool, refreshed feeling. However, I would take white grape juice over almost any soda. That stuff is gooooood.