Short on time? Disneyland Resort (Anaheim) can wait.
Allow Full day (or two).
The gold standard of theme parks — Walt's original, with Galaxy's Edge, classic dark rides, and a level of polish Universal can't match. The catches are the big ones: it's a 30-50 minute drive south of LA, expensive once you add the Genie+ line-skip, and exhaustingly crowded on peak days.