Duability - Pelican.  my dog even tried to chew on it.  I still have the original one I purchased.  I did wear out a watershed.  The handle pulled lose from the bag the outer ends where it sealed eventually turned white and wore out.  I also liked pulling into an eddy with the pelican between my legs and pop my skirt and literally toss it up on rocks on the shore then climb out of my boat.  My Watershed I would have to carefully set it up on the rocks then get out of my boat.  Also, in the Pelican I have dropped it from high heights straight into the water to a raft or kayak below then jumped in.  I would never do that with my watershed bag.

 

Quick open - Pelican, here comes the circus, flip, flip camera out.  Watershed takes longer to unbuckle and unroll then unzip.  Same for putting it away to sprint back in front of the circus for the next shooting spot.

 

Waterproofness - equal.  You have to watch with the Pelican that you do not get a strap or something similar in the lid when closing it.  Watershed, make sure it is sealed and you have to periodically grease the seal.

 

 

I started out with a Peclian then went to a watershed then went back to a Pelican.  A lot of it depended on what boat I was taking and where the camera was going.  If the Peclian could fit behind me, I would take it.  If the camera had to ride between my legs, I usually took the watershed.  If I was steep creeking, Pelican.