days without feeling like you missed out on anything too much. But WDW, you need 4+ days to experience enough to be fulfilled.
Of course, that's for people who can go once a year or two, or even less often. For people who can visit a lot, that might be different.
The proximity of everything at DLR is an awesome thing.
But I really think Disneyland Resort is best. The history is a big part of what makes it so awesome, too. It's the park Walt built.