I recently wrote a Fantasy Premier League article for the FPL site Togga. I highly recommend heading over there and reading my post Top of the Table: Selecting Cesc or Alexis in FPL Midfield. I focus on making the choice, if you need to, between Cesc Fabregas or Alexis Sanchez for your midfield based on their statistics through the season to date.
While you are there I would definitely suggest that you stick around and read up on all of their great Fantasy Premier League tips. They have some excellent content as well as a great FPL product with their draft style fantasy leagues.