I can say that the Turkey at Garden Grill is very good as is the meal in general. I haven't been to Liberty Tree in forever, but I always hear mixed things. Garden Grill is one of my favorite on-proeprty restaurants (though that is largely due to the steak with chimichuri which you will not be partaking of). The sides are good too though - good mac & cheese! Maybe base it off of that and the desert? Note that GG sometimes changes out the desert seasonally (though it's always been good - I am partial to the strawberry shortcake).