Agree with RIPEXPOS. Turner has pure 80 speed + could stick at SS. I thought he was a better bet than Pentecost too. He's also not that risky because he's a college guy, starting at SS so he can slide around the diamond almost anywhere.
Pentecost has a rounded skill set but no impact tools. More importantly, catcher defense is so intricate these days that the best thing to do IMO is wait for MLB data and then acquire a backstop that you absolutely know can catch and throw at the big league level, call an MLB game, frame MLB pitches, blah blah blah.
Trying to develop your own catcher is pretty risky because until they get to the big time it's hard to really know if they are even a viable defensive player. I'd rather draft the up the middle guy with an impact tool and if I have a hole at C in the future, try to acquire someone like Grandal or Montero or even Hanigan. Someone you know can frame a pitch and do most other defensive things well.