I have been to Disneyland and Disney World several times.
My opinion is Disneyland is better then the Magic Kingdom.
Smaller Park = Less Walking with more Rides and Attractions better thrill attractions and generally better versions of the same attraction.
Less stressed out crowds Disneyland is seen more as a locals park not a once in a lifetime visit for most people.
Better Night Time shows. Fantasmic is awesome at Disneyland.
Opening Day Attractions
nine opening-day rides still in operation to this day. I love nostalgia.
And better the availability of characters, and unique ones at that, in Disneyland.