Boys or girls or both?
Given my experience with pre-teen boys, buffets, buffets, buffets, lol (and I know it will only get worse as they enter their teens). The Wave has a very well priced breakfast buffet that gets really excellent reviews (we have an ADR coming up this August...first time, and I'm excited). Otherwise, Biergarten, Crystal Palace if they're ok with characters, Tusker House even if they're not ok with them, and an all you can eat place like 'Ohana, Liberty Tree Tavern, or Garden Grill. Other options that appeal to my pre-teen sons are 50s Prime Time, Sci Fi, Yak and Yeti, and Tokyo Dining (they love their sushi). Eating QS around the WS at Epcot is fun too.
When my nieces were teenagers, they enjoyed both the French Pavilion QS and Chefs de France in Epcot, Via Napoli in Epcot, just about anywhere at AKL but especially Jiko, Tusker House in AK, both 50s and Sci Fi in DHS, and Crystal Palace in MK. They were in college when BOG in MK opened, and we have our first res there coming up in August...they're thrilled.