In a keeper league, I have to go with Votto because of the high average and very good peripherals (ISO, walk rate, declining K rate, significant HR potential, good park)..
But based on some of the comments, Bautista is still underrated, which blows my mind. I debated which CI to add in early May of 2010 - Joey Bats or Troy Glaus. Joey Bats or Troy Glaus ... debated. Thought about it.
Added Glaus. Watched Bautista get hot. Still a FA. Waited a little more. Lined up the "Drop" Glaus, "Add" Bautista .... then wavered.
Bautista hit 2 HR's in the middle of May, and I said, "Darn it, should have added him." Went to add him ...
Too late. Gone as a free agent. Had to trade a lot of value in 2011 to get him (in OBP league)..
I presume you get just one keeper, since otherwise you keep both.