Well, I don't think the Values are awful at all, but given the choice, especially if one or two of the 6 ppl are smaller kids, I think the cabin wins hands down. You'd have to stagger morning shower times, but the time and money saved by eating breakfast in every morning is pretty good. Plus there's a full sized fridge, so even if you only do a couple of lunches, and a couple of dinners 'at home' you be doing well.
Plus Ft Wildnerness is really just a cool place to stay. Short boat trip from MK and monorails to EPCOT, lots to do at the campground.