IBC vs. Goose Island

I bought a six pack of IBC root beer, my go-to college root beer.  Loved it with a cool bag of pizza combos.  It tastes as I remember - very sweet, soda-ey.  Kind of a generically good root beer.  Your good ol' macro root beer posing as a micro brew. 

Goose Island comes in a pack of 4.  Their shtick is that it's made with 100% cane sugar.  I've had this before - the root beers that Marshalls and TJ Maxx sells have this too.  It definitely tastes different.  A little less sweet than IBC and its corn syrup sweeteners.  And almost a grape juice aftertaste.  Not sure where that's coming from, but the flavor is not really classic root beer.