Fuel is very easy to find. Fuel costs seem slightly lower for the X-Pert and it burns about 20 percent hotter, meaning your hungry Scouts will chow down sooner. True, the initial cost of the X-Pert is higher, but I think it will be a better investment. No matter what stove you decide on, I think it's important for a responsible adult to be close at hand. Though the Turbo and X-Pert are what I would consider safe stoves, they both use highly flammable fuel and burn at high temperatures.
Accidents can happen.
But enough preaching. Have fun with the group and let me know what stoves you decide on and how they work out.