After growing up on Vernor's ginger ale, both Seagram's and Canada Dry seem horribly tasteless to me. I don't drink a lot of pop - I'm not terribly fond of sweet beverages - but when I do it's Vernor's or A&W root beer.
Coke edges out Pepsi in the cola wars. Was surprised anyone else had heard of Faygo to list it in the survey -- I'm sensing a seekrit Detroiter. :)
I like carbonation but not the sweet so much as I said so my usual choice is unsweetened, flavored sparking waters.