If you're only doing 1 character meal (& especially w/ your age group), I would definitely choose Chef Mickey's!
Chef Mickey's to me is just the epitome of a quintessential WDW meal (& experience). The location at the Contemporary w/ the monorail running through can't be beat, and all the "traditional" characters (Mickey, Minnie, Chip, Dale, Pluto, Goofy, Donald) are there. And the atmosphere (the napkin twirling & lively music) is so fun too!
Plus, like others have said, it's a buffet, and, most of the time, everyone can find something they like on a buffet.
Edited to Add: Because it is so popular, Chef Mickey's is sometimes hard to book w/ the time or day you want, depending on what time of year you're going. And it especially might be difficult to book for a party as large as yours. So, if you decide upon Chef Mickey's, I would suggest you call & book it as soon as you can.