If you are going to self support then the only obvious choice between those two boats is the Jefe. The Hoss is a great boat that will, but its got a much smaller stern and would be quite stern squirty. The Jefe will possibly take a bit of getting used to, but its plenty stable and friendly. It is, after all, designed to be a boat that will allow you to forget about the boat and worry about the rapids and staying safe. It also has the creek seat in it, which will make putting gear in the stern much easier (the back of the creek seat is much lower which gains you access to the rear end of the boat). So yes, for hard rivers that you need to self support, the Jefe is the obvious choice between those two boats. You might also consider a DragoRossi Mafia, Liquid Logic Gus, Riot Magnum, Fluid Solo, or Pyranha M3 or Micro. All of those boats are similar but offer a different feel if the Jefe doesn't feel like the answer. Good luck and have an awesome trip.