I have gone to both in recent years, and I would give the nod to Disneyland in being my preference between the two destinations. It helps living on the west coast, but I prefer most things about Disneyland. I think there is definitely a source of pride with the cast members of being the place that Walt walked.
As others have mentioned, some of the attractions such as BTMRR and Pirates are superior to their WDW counterparts. But I would argue that Splash, Jungle Cruise (mainly just due to Schweitzer Falls being allowed to use a large amount of water), Space are superior at WDW. Indiana Jones Adventure embarrasses Dinosaur in my opinion, though my last ride on Dinosaur was better - it's still just too dark. DL and DCA also have some unique rides such as Incredicoaster, Matterhorn, lots of dark rides in Fantasyland - Toad's, Snow White, Pinocchio, Alice. Toontown is skippable to me, Roger Rabbit's Cartoon Spin is only for those that are fans of Roger Rabbit. In DCA, I would say that Radiator Springs Racer is vastly superior to a Test Track. I prefer GotG over ToT, such a fun vibe and with the different music every ride helps add some variety. Plus, I am a huge fan of the Marvel movies, so it's perfect just standing in the queue looking at all of the artifacts.
The parks feel much smaller, but I find I get much more done in my day at DLR than at WDW, and that includes having a break midday since the hotels nearby are walking distance rather than get on a monorail/ferry/gondola to get back. I would urge you to get the park hopper and Max Pass. Disneyland and DCA fit in the same footprint as the Magic Kingdom, you can get a lot done in the two parks if you're a rope dropper and utilize your Fast Passes well. My wife and I found that if we actually rope dropped the park that didn't have Morning Magic Hours it was much less crowded. And even once they let you into the park early to walk down Main Street, you can begin racking up Fast Passes for either park! That's why the Park Hopper is valuable.
I feel like I could talk all day about enjoying DLR over WDW, I will just end with that if you have never been to DLR that it is worth the visit!