Having no guidlines to this I would go to DLR. Of course part of that is due to the fact that I live in NOR CAL and flying a family of 4 to WDW is way more expensive then piling in the car to drive to Anaheim.
I'd rather go to Disneyland. It just is more magical to me. But if presented with the chance to go to WDW or any other Disney resort for that manner, I would certainly never turn it down. Personally, I'd like to see DLP.
I want to go to Disneyland. It's a shorter drive than it is a flight to WDW. It's just easier to go to DL. Plus the last park I went to was WDW and it made me home sick for DL. I loved going to WDW and I want to go again someday but I could wait awhile.