Definitely make sure you see
World of Color at California Adventure!
You'll love the resort entrance into DCA as well - you'll be steps away from Soaring (Over California), the Grizzly River Run, and just a short walk to Toy Story Midway Mania, and the new Little Mermaid ride that will open in May.
At
Disneyland (also just a very short walk away), Fantasmic! is much better than the WDW version, though you won't have the same kind of seating. At DL it's performed on the Rivers of America in Frontierland/New Orleans Square and you'll be sitting on the ground. The seating was an improvement made at WDW - but the show quality and caliber is much higher at DL.
Things you won't find at WDW include: in Disneyland...the Matterhorn Bobsleds, Roger Rabbit's Cartoon Spin, Davy Crockett Explorer Canoes, Alice in Wonderland, Casey Jr. Circus Train, Mr. Toad's Wild Ride, Finding Nemo Submarine Voyage, the Grand Canyon diorama (as part of the DL Railroad between the Tomorrowland station and the Main Street, USA station), Indiana Jones Temple of the Forbidden Eye, the ORIGINAL Enchanted Tiki Room (no "Under New Management" version like at WDW), Pinocchio's Daring Journey, Storybook Canal boats, Sailing Ship Columbia.
in California Adventure... Monsters Inc ride, A Bugs Land (with several kid-sized attractions), California Screamin', Silly Symphony Swings, Golden Zephyr, Goofy's Sky School (opening some time in the spring).
There are lots of similar rides/attractions - but as Deb & Bill said, many are better (and longer) at DL than at WDW.