This was super hard! I went with a method of knocking out parks based on what I didn't like to get to my answer. Hollywood Studios was my least favorite because there was no freaking shade. This PNW girl struggled. Then came California Adventure which was hard because I really love it but not as much as the rest, again minimal shade and I don't love the food options. Then Magic Kingdom because it felt like DL but spread out more and I didn't find it as charming. Again, still loved it but not as much.
Then there were three. I based these on if I was going to go over and over again. That knocked out AK which killed me because what a park. I can't wait to get back there. This leaves Epcot and DL. If Epcot had more rides that didn't make me sick it would win because of the food and World Showcase. I could spend days there alone just eating. But Disneyland has my heart. I'll never forget my first trip in 1989 and there have been countless since then. I could go there and not do one ride, just soak in the sights, smells and sounds. When I walk through those gates it's like the weight of the world slips right off my shoulders and I'm a kid again.
That being said I love all the parks and can't wait to get back to DW, it's just a much longer trip for me.