The TSO concert was on Dec 28th, and the VGL concert was on the 20th.
I've seen VGL three separate times now. I first saw them at BlizzCon 2007, and again at BlizzCon 2008. Both performances were phenominal. Listening to them perform the music from the first Starcraft game, especially the Terran themes, was incredible.
This time around, there was not a lot of Blizzard music. That's completely understandable, as there is a LOT of game music out there, and Blizzard makes up only a tiny piece of that. They played music from Zelda, Tetris, Chrono Trigger, and a game I'd never heard of before (but that was produced right here) called Advent Rising. Overall, it was an extremely enjoyable show, and I'd recommend it to anyone, but the moral of the story is that the Blizzard music is better than most.