If you are only doing one park, I'd say Disneyland.
Disneyland would be the best.
Depends. My 9 year old doesn't like roller coasters so he prefers Disneyland but my 7 year old loves Disney California Adventure much more for the rides.
Definitely Disneyland if you could only go to 1. More rides for them to do
Probably Disneyland. CA Adventure has the larger rides but does have rides for smaller kids also.
I would say Disneyland. It has more rides that they can enjoy.
Depends on their interest and ride comfort. Overall I'd say Disneyland.
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