I grew up in Los Angeles, so I've been to DL well over 300 times now. I have also been to WDW on 9 separate vacations, but have probably visited the MK about 55 times now.
I had to really think about this and look at each park objectively and matched them up in 10 different categories. For each category, a park was awarded 10 pts to the winner. In the case of tie, the pts were divided up, 5 each.
Categories I rated each park by, with the winners and points awared:
Overall Cleanliness, Theming, Layout and Immersion -
DL is themed very well, cleaner and has lots of nooks and crannies and quaint areas plus more history. MK has a much better layout though and immerses you way better and does not have numerous outside world distractions that DL suffers from.
WINNER: TIE DL 5 pts/MK 5pts
Size and Scope -
DL is obviously much smaller and more cramped and most buildings and attractions are less expansive. MK on the other hand is quite vast in comparison and much more spreadout and has, for the most part, much grander buildings and attraction environments.
WINNER: MK 10 pts
Number of Attractions -
DL has a whopping 40+ attractions to enjoy, while MK only has about 30. DL utilizes the limited space it does have better than the MK.
WINNER: DL 10 pts
Restaurants -
DL has a lot more variety offered in the park's restaurants and overall the food quality and menu offerings are much better in their locations comparitively speaking. MK does have a few very unique locations as well that aren't no slouches. But the overall quality and variety are just not on par with DL's restaurants.
WINNER: DL 10 pts
Attraction Designs & Queues and Theming -
DL has a few attractions that are amazing in design and theming and those are extremely well done. However, DL's queues are by far inferior and fairly lackluster with a couple of exceptions. MK has just as many attractions featuring a ton of detail and theming as well. But MK just kills it when it comes to the queues and theming overall for attractions.
WINNER: MK 10 pts
Unique Attractions -
DL has 13 unique attractions that are not found inside the MK. Meanwhile, the MK has 10 unique attractions not found in Anaheim. DL has the slight edge here.
WINNER: DL 10 pts
Attractions Head-to-Head -
For this category, I basically put all of the attractions that both parks had up against each other. The list includes the Railroad, the MS vehicles, the Jungle Cruise, the Tiki Room, Pirates, Splash, Big Thunder, Tom Sawyer's Island, the RoA riverboat, the Haunted Mansion, Peter Pan, IASW, the Carousel, Pooh, Dumbo, FL coasters (Gadget and Goofy), the teacups, the TL raceways (Autopia and TL Speedway), Space Mtn, the TL jets (Astro Orbitor and Orbiter) and Buzz. This was just too close to declare a winner and was a essentially draw. DL has a few that beat the MK's, the MK has a few that beat DL's and then there are a few that both parks' are equals.
WINNER: TIE DL 5 pts/MK 5 pts
Crowd Management -
DL's size dooms it in this respect. Horrible congestion in more than a few chokepoints cause bottlenecks that are downright almost impossible. DL also does not do well organizing areas during parades and fireworks. The MK's size helps it a lot, coupled with better walkways and more efficient logistics in terms of crowd dispersal, the MK just handles crowds 1000x better.
WINNER: MK 10 pts
Entertainment -
This one was hard. DL has Fantasmic! and overall, some cool and unique bands and entertainers performing in the lands/areas of the park. But then the MK has some of it's own like the Liberty Square Muppets and the Castle stage show, as well as fireworks that just shame DL's show (**DL's fireworks are lame in comparison, in part due to CA fire laws, the fact that residents complained about noise and it is in a city, so they can't fire off really big ones or crazy ones).
WINNER: TIE DL 5 pts/MK 5 pts
Adding up all the points, I ended up in a dead heat tie. Each park scored 45 points total. So I didn't vote. I truly believe each park has it's fair share of awesome pros and not so great cons. I love both parks to death and always enjoy visiting both every single time for differemt reasons. I did not purposely rig the points to be a tie, either! LoL I thought there was going to be a winner when I did this. But I also do know I feel like they have strengths and weaknesses in different areas, so it kind of didn't shock me that I ended up with a tie.
That being said, I know this is just a matchup of DL and the MK. But if someone asked me overall which resort I love more and enjoy going to more, WDW wins hands down with no question or any doubt in my mind. But for the main parks by themselves, I guess I love both equally and think they are equals for different reasons of their own.
I would highly recommend all Disney park fans to experience both parks. Those who only have been to DL are missing out on some amazing things the MK offers. And those who only have been to the MK are missing out on some great things at DL as well.