I voted tan, but I think both can be beautiful depending on what suits each person. I do think a healthy glow looks great on everyone, but what I truly think is most beautiful, is healthy and natural skin that hasn't been damaged either by skin bleaching, tanning beds, etc.
Well, I'm a Cali girl... so tan is what I'm around the most. And even before I moved to Cali a couple years ago, the other areas in the countries I have lived in before were Sunny and near the beach, so I'm used to it because of that too. I don't have a preference towards the opposite gender's skin type, but someone with dark tan skin and blonde hair, or dark tan skin with blue eyes are more unique (which intrigues me more).
I kinda like both actually. Maybe lend a little bit more to tan (in the opposite sex then). I have a very pale skin. White as snow and I hated it for a long time, because I was being mocked on for it, but now I learned to like my pale skin and I would only look weird if I was tanned.
Pale, it's more exotic... for me xD I come from an island, everyone is tanned there. But I prefer that golden color that's between tanned and pale. So a little tanned is great, but not like you've been a whole week sunbathing.