Are you planning to tour with the trailer, or will you be hauling everything on your bike? My own instinct would be to go with the lighter bike, especially if you're planning to ride it unloaded too - but I think that goes along with my habit of pulling the trailer (if I fly to my tour, or if I'm doing a camping trip) or using my smaller front panniers on the rear rack, trying to carry as little gear as possible.

Another factor is probably the types of roads you think you'll be traversing. Rougher roads (to me) implies that you might be happier with the heavier bike.

--- Denise