I'm not going to get into dishes, because at Signature Restaurants, the menus change seasonally as they should at any top restaurant. But in answer to the main question, my favorite is California Grill. Is it the best food on property? No. Might not even be in my Top 5. But the hard truth is, other than V&A (and on good nights, bluezoo), none of the top restaurants at WDW are truly "great" restaurants when compared to the outside culinary world. So my favorite Disney Signature experience has to bring more to the table (pardon the pun) than just food. Most of the Signature restaurants at WDW are "just restaurants" that could be located anywhere. But the California Grill is the one and only restaurant on property that really shouts: "Only At Disney World" and for that reason, it gets my vote. Can I get a better meal at Citricos or Il Mulino? Often times yes. But nothing about either of those places sets the Disney stage the way California Grill does. And every single Capital Grill that I have ever been to blows Yachtsman out of the water (again, sorry for the pun), so I could never put that one at the top of my list as it just sits within the hotel like any ol' restaurant without transporting my to my Happy Place. So for me, the restaurant that check the most boxes, with "I can only get this at WDW" being a very big box, California Grill wins for me, even though I concede that when I dine there I am not getting the very best food on property.