Bourbon (a good one, like Buffalo Trace)/Vodka (GAH!..tastes like...like...like vodka...and 2 lousy shots and it's a guaranteed hangover, too, for me, whereas I can drink a fair bit more bourbon or other whiskey; bit of the opposite, I'm told, of other people, for vodka)
I don't drink much hard stuff these days; more beer. But if I do, a good bourbon has always been my favorite. Least favorite, as said, vodka, although tequilla comes in near last also. Don't even like top-shelf tequillas.