Based on my experience and the threads I've read, you'd be better off with the all you can eat platter. Most people I've heard from enjoy the platters, but the a la carte meals can be mediocre on occasion. I hate disagreeing with the person who enjoyed their nachos, but when I had them in mid-August, the meat tasted like canned chili (what little there was of it), and there was virtually no cheese, or tomatoes, or onions, and no jalapenos at all. There's another thread on this site where someone else says the same thing. My DW and DD4 had chicken dinners, and though acceptable, the chicken was quite bland. Their mashed potatoes were good, however.
On the other hand, those ordering the platters seem to get fresher tasting, better food. In our case, perhaps it was because most people were ordering the platters and the turnover kept the orders fresher. I'm not sure. The experience is quite fun to be sure, but I wouldn't expect superior food (though I hear breakfast is better).