I drink my vodka on the rocks with a lime. Belvedere, hands down. I tried Chopin, but I personally didn't like the taste as much, but I recognize it is a great potato vodka.
Grey Goose might be of higher quality than Smirnoff, Absolut and the like, but it taste like rubbing alcohol taken straight. Take it from the freezer, then you have thick rubbing alcohol. GG is fine if you mix it with soda.
Vodka like "Level 1" appear to be marketing hype like Vox water. Level 1, like GG, taste like rubbing alcohol.