If you've previously done WDW a few times then why not give DL a try!
The Grand Californian is a beautiful hotel and you'll love it's proximity to the parks.
I prefer
Disneyland to WDW myself, but I'm biased, I love it & have grown up on it.
I love that it's "Walt's Park", I think that it has much, much more magic than any of the other parks. It's the original park and ahs wonderful history The cm's there are wonderful.
There are some great rides you can't ride at WDW
Matterhorn
Indiana Jones
California Screamin'
Soarin'(although soon to be at Epcot)
Alice in Wonderland
Mr. Toad
The Aladdin Show
The Animation Building is not to be missed!
Plus, the Haunted Mansion Nightmare Before Christmas Overlay
Storybook Canal Boats
plus there are some duplicate rides that are much better at DL vs WDW
Pirates
Space mountain
the exterior of IASW is gorgeous at DL, esp at Christmas
Grizzly River Run(vs Kali River)
The Blue Bayou restaurant is amazing! The Disney Gallery is wonderful
Fantasmic! Is better at DL, especially if you get the Dessert Buffet Balcony seating!
We've had better character interaction at DL.
DL & WDW are both wonderful and there are great reasons to try out both!
Let us know what you decide!