Disneyland is much smaller, but for efficiency, charm, theme, etc. I'd have to say it's a much better experience than any single park at WDW. I'd also argue that you can really say that Disneyland + California Adventure are so close, it's kind of best to treat them as one park (park hopping FTW).
For us, I'd say the real winner at MK is the large castle.... it's impressive. We are taking our daughter there for lunch on the trip in a few weeks. We are very excited to do that.
We need to try a few more things, but I'd say quick service dining is better at Disneyland resort. There are a few notable wins at WDW we liked. Some of the treats at EPCOT (school bread was awesome). Also, the sausage gravy tots at the Friar's Nook were a guilty pleasure I have to admit I liked...
@MrsNVDISFamily was very sad to hear they don't have the veggie version of the Ronto Wrap at HS (this needs to happen!!!). It's also a perk that you get the
DVC discount on a majority of the quick service options at Disneyland Resort too.