Having been to three:
WDW has the best 'bubble,' best Haunted Mansion, great food and tons of different places to get it, the world's only Epcot, Animal Kingdom, and is an amazing place you could spend a month in and not see everything. Unfortunately upkeep isn't great and the non-MK parks don't have a ton of rides at them. Also Illuminations is dead now, and life is barely worth living without it.
Disneyland has the best version of nearly every ride, is jam packed with stuff, oozes history... but California Adventure kinda sucks and the parks are really small and lack any real sort of bubble.
Tokyo is perfect except for the fact it is all the way over in Tokyo.
WDW has the best 'bubble,' best Haunted Mansion, great food and tons of different places to get it, the world's only Epcot, Animal Kingdom, and is an amazing place you could spend a month in and not see everything. Unfortunately upkeep isn't great and the non-MK parks don't have a ton of rides at them. Also Illuminations is dead now, and life is barely worth living without it.
Disneyland has the best version of nearly every ride, is jam packed with stuff, oozes history... but California Adventure kinda sucks and the parks are really small and lack any real sort of bubble.
Tokyo is perfect except for the fact it is all the way over in Tokyo.