Panniers or Trailer?

Major Dan
Major Dan Posts: 53
edited November 2009 in MTB rides
I'm planning a 2 week XC touring holiday on Morocco, and am starting to layout my kit (seeing as it's pishing it down outside!)

Never having spent anytime touring (I normally ride out and back) one thing I can't make up my mind about, is whether to use panniers or a trailer.

How many of you tour offroad, and what pros and cons have you found with either?