I'd suggest a braid over mono.  Mono degrades and has memory and is much less durable over time.  Personally my behaviour with a ditch kit is something that gets assembled once and unless used goes untouched for years.  By the time I need that fishing line it would likely snap under the weight of bait.

Dave Hadfield has a neat fishing rig that could be used for a ditch kit too.
  (You need to Login or Register