The NL West will definitely be fun to watch between the Padres and Dodgers. The NL East will be fun too and the central is always a dog fight. The Yankees should win the division this year. Tampa's not a better team by trading Blake Snell, although the Blue Jays might put some pressure on the Yankees. These are who I'm picking to win each division:

AL East: Yankees
AL Central: White Sox
AL West: A's
NL East: Braves
NL Central: Cardinals
NL West: Dodgers