You should try them both out.  They call them fairway woods for a reason, hybrids are also called rescue clubs.  If you're looking for a long option out of the rough, the hybrid tends to be better.  The fairway tends to be a little longer on distance, but part of that is the longer shaft.  Based on the courses you play, you'll decide on which use will predominate in your game.  I'd like to say the hybrid will have more backspin, but after watching Zack Johnson have 5W check up on a green - that may be my personal observation.

Personnal preference plays a huge factor.  Some can't hit a hybrid and vice-versa.  In my case, a 24 hybrid and a 21 degree fairway complement each other.  But I can't hit a 19 hybrid as far as the 24 hybrid.  It might be mental, or feel of the head (hybrids feel more massive) makes a difference.