Which game would you rather see announced?
Personally I would rather see a new Fallout. Skyrim was only 2011 and Skyrim is still fresh so I don't think a new one is needed yet.
Fallout on the other hand, was like 3 years ago so it would be interesting to see what a new one would be like. Dynamic weather effects, improved melee, etc.
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You're forgetting they're going to destroy TES with the new MMO, similiar to Bioware's mistreatment of TOR. We'll see if the Franchise can survive that. I'm guessing Fallout 4, though I'm personally indifferent. Fallout 2 was the best Fallout.