I'd have to say the Braves won't gel in the team chemistry area at least not right away and will miss the 2013 playoffs but largely due to injuries being the tell-tale reason Atlanta misses postseason.
The Yankees as others here have said are old and aren't the championship caliber club the were or ever will be again with their current roster and the on the outs relationship with AROD gets old fast as the New York media asks the daily question of the Yankee players- What have you heard today about Alex? GMCashman starts the Yankees retooling.