I had one on Saturday from Kua Aina at Ward. While eating it I was thinking about this thread and it occured to me what that one of the things that might make a burger enjoyable to eat would be the lettuce.

If it's shreaded like the Big Mac and the Whopper then there is a tendency for the shreaded lettuce to drop from the sandwich which is to me a bad thing.

Kua Aina's burger had the entire leaf with the stiff middle part in it. If the lettuce is in the burger it makes the sandwich way thicker, which might be a problem to eat it, but at least you have the option to use the leaf or not (and you can always eat it by itself).

For the life of me I can't remember which burger had just the lettuce leaf without the stiff middle part.