I'd go with a pontoon over a canoe or kayak for floating the White or Norfork when they are running generators. Swamp a canoe or kayak in big fast water and your gonna have a problem.
I wouldnt want a toon if I had to cover allot of slow water, paddle upstream, or fight the wind.......but they do excell on fast flowing water, mild whitewater, and they are virtually impossible to flip....Wear your PFD, carry a pump, and you should be just fine in a toon. Cheers.