DL all the way for me, you have alot of things you can do at DL plus california adventrue so cant lose out...Universal for me gets boring after awhile because there isnt much to do as DL
I've been at DL a few times. It is busy, but not overly crowded. Plus where else can you see a parade for the pardoned turkey (or turkeys as it was last year)?
Also as a break from the parks, the hotels offer a traditional Thanksgiving meal in their banquet rooms.
Disneyland, unless all you want to do is watch shows. There's only 4 or 5 rides at the US in Hollywood. Its still a great park, but it pales compared to DL.