Galaxy has a better display, its lighter.
I used to think the "lighter" aspect was no big deal. But having my tab for a week, you definitely notice the weight after 5-10 minutes of holding it.
I was in BB yesterday looking for a case, and picked up a Xoom to mess with it. Unbelievable how much heavier it is compared to the SGT. Ditto the ASUS Arconia.