For me Disneyland offers a number of advantages.
1. Pirates is much better, and its location far better integrated into the park. Haunted Mansion is also in a better spot. Small World is better. A lot of people like Space Mountain better, though I think it's a wash (I sort of like that WDW's is wilder). You get to shoulder your gun on Buzz. Main Street..... no comparison. MUCH BETTER! Fantasmic is performed on Tom Sawyer's Island, and the mere fact that this is possible makes it wondrous even before your proximity to the action factors in. The entire feel of the park is superior to Florida's version.
2. Radiator Springs is amazing. California Screamin' is an excellent coaster. You can actually get near Toy Story. No Illuminations sucks, but World of Color more than makes up for it. There is a lot more to do in California Adventure than in any of the secondary parks in WDW.
3. Everything is ridiculously close. The parks are right next to each other, and attached to Downtown Disney (which with the exception of having no Raglan Road is better, in my opinion, with a more unique nighttime atmosphere). The hotels are right there.
4. Disneyland Hotel is a wonderful place if you can stomach the price.
5. There aren't as many options, but on the whole the food is much better and more diverse. I'm a big fan of Jiko and California Grill, for instance, but there is nothing like Napa Rose in WDW. The Carthay Circle WOC package beats any show package in WDW. And the quick service options tend to be more interesting.
6. It's sunny. Pretty much ALL THE TIME.
7. Maybe the most important. You're in Los Angeles (okay, Anaheim, but consider what they call their baseball team) and not Orlando! I mean, let's be honest here. The Bruery is 10 minutes away. Downtown L.A. is 45. San Diego is only an hour or so south if the traffic isn't bad. The Central Coast wineries can be reached inside two hours. Inestimable advantage.
But there are also cons:
1. Pricy hotels (though staying offsite at economy motels still allows you to walk to the parks). Additional fee for parking. Come on, Disney....
2. No Animal Kingdom (though many are blah about it, I like it a great deal)
3. Way more hotels with excellent theming in WDW. Paradise Pier isn't particularly Disney (in fairness it wasn't built by them), and the Grand Californian is impressive but obscenely priced.
4. Tomorrowland doesn't have the same retro-futuristic cool as in WDW. Plus no Laugh Floor = Boo. (I just saw the pun there....

)
5. Yes, there are places where you're going to be reminded that you're on planet Earth, and that the decidedly un-magical world is a few-hundred yards thataway.....
Wash: There is no judging if there are more drunks (and if they are drunker) in World Showcase or California Adventure. There is no judging which place is more likely to have the most obnoxious tourists on any given day (though on the weekends the locals in DL might sneer at you). You are just as likely to be fleeced of the contents of your wallet on both coasts. On the whole the performers are better in DL, but if Pluto just flunked his audition for Days of Our Lives he is much more likely to mail it in.....
Conclusion:
GO!!!!!