The other HUGE difference is the WolfPack has fiberglass sides vs the aluminum, that is a significant cost too, and generally speaking helps with resale too. The fuel tank is a big plus and means you're not carrying gas cans, but only you can decided if it's needed by you.
I'm not sure where the quality comment comes from, but if you are going based on the Coleman name that is a non-factor, that is just a financial arrangement to use the name. The Coleman brand has nothing to do with quality. Dutchman makes the Coleman units.
As far as price, you've listed the asking price my gut says you could probably negotiate them down to about the same price.
