Well, to start with neither I believe the musical score fits Fallout or a Elder Scrolls game.
It reminded me rather of a score to a WW2 game, which it would fit quite okay. But the theme has filmic scope, which the theme to The Elder Scrolls IV also had, but it wasn't a very concrete piece of music and neither is this one. Just suspense.
I've never liked the Oblivion theme but the rest of the music in Oblivion was fantastic and the only thing worth applauding, so taking that into consideration I wouldn't use the music on the teaser page as a stereotype of what the music will be in Fallout.
Oh, and the concept art on the teaser page is really epic and beautiful, but if it's Fallout i don't know. But it is something that we haven't seen from Bethesda before, so perhaps that is something positive.