Yes, the castle is smaller. Yes, there's not a Disney bubble around it. It's not the same Disney experience at DLR and that's just fine. Disneyland is so much more intimate and enjoyable, IMO. I love that it's a smaller park and you don't have to undergo the huge investment in time and stress to get to the parks every day via a shuttle or monorail. I'm in two frames of mind when I go to DLR vs. WDW. WDW I'm a lot more stressed because it's hotter, more crowded, more FOMO-ish, and there's never enough time combined with that Florida weather that drains your life force. That said, every time we go to WDW, we have a great time. We have an even better time at DLR because it just suits our family better. Getting back to the hotel for a quick afternoon swim isn't a chore. We're not waiting on a shuttle that may not arrive for a while.
I once thought before we had ever gone to DLR that there was no way it could compare to our magical Disney vacation at WDW in 2015. Boy was I so very wrong. It made me upset with myself that I never went prior to then. DLR is beautiful park and from the moment you walk through the turnstile and see the sign above the tunnel, you are transported back to that time when Walt first opened the park. I've also found that the guests at DLR are just so much more laid back. There's less parents yelling at their kids and trust me I get why that happens at WDW. It's a high stress environment. I love those cool California mornings and the fog layer as opposed to sweating at 8am. Maybe we're just going at the wrong time to WDW but we've never had a bad trip to DLR weather wise outside of some mid-afternoon heat. There's so many little things in DLR that make it great. The little touches that Walt and the Imagineers did that make it special. There are lots of little places to just take a moment, relax, and enjoy what Walt created. Our Labor Day trip to WDW just made me want to go back to DLR even more.
If you've never been, the answer seems simple to me. Go to the park that started it all.