Hmmm, I’m torn. For Martinis I always like Ketel One, a splash of champagne and pineapple juice. If I’m drinking it straight and chilled I like Stoli b/c I must say they have some of the best flavored vodka out (stoli blueberry anyone? I got PISSED halloween night last year courtesy of that little treat) and three olives actually has a caramel vodka out that I wouldn’t mind drinking straight out of the bottle (chilled, of course) if it didn’t make me look like a prime target for AA. But if you’re making a bloody mary, you have to go with absolute pepper vodka.
So I guess it all depends on the drink you’re making. but since most of the time I’m drinking vodka, I’m drinking a martini, i have to go with Ketel.