I haven't gotten around to trying Snake Oil just yet, so I have no frame of reference for that particular scent, but Green Tree Viper is a completely different creature from bottle to skin. In the bottle, mint mint mint. Really nice, subtle changes, and I'd definitely say I can pick out at least two different mint notes, but that disappears quickly after application to skin, where it becomes musky/spicy, which I can only assume is the Snake Oil.
It's not something that I'd generally go for, but I do really like this. I just wish the mint stayed for a little longer.
ETA: randomly, after a night's sleep, the lovely musky scent is still there, and I love it. Maybe this means I should spring for some Snake Oil.