foster vs. chaney

I just heard that Foster will now be playing in the Nickel.  Knowing that and the move to the middle for Chaney, which guy would you rather have moving forward?

I think Chaney is a safer pick as he will likely be the every down MLB for the rest of the year where as Foster is only the every down MLB because Black is out injured. It's yet to be determined if Foster will continue to play in subpackages when Black returns. I like Chaney more.