Several years ago, we spent a couple of days at Universal, since we'd never been. We stayed at Portofino and loved the hotel. After that, we moved to Disney for our usual 5 days. And loved that, too. We probably did not do justice to Universal, but the Harry Potter World is delightful. There are some excellent restaurants available there, too both inside and outside the park.
The advice to break your stay between 2 Disney hotels is very good advice. WDW will move your luggage for you to the new hotel at no cost. That is our plan for our next visit, which unfortunately won't be until late 2025, as we're working with our schedule and that of 3 adult kids and their families. I have never stayed at Animal Kingdom Lodge but we plan on 2 nights there on the Savannah, then moving probably to Yacht and Beach Club, or to the Contemporary.
We have stayed at Port Orleans for a spur of the moment trip (we could get rooms in there on short notice), Boardwalk, Wilderness Lodge, Contemporary, and The Swan (on-site but not a Disney hotel; Marriott). Of those, the Swan was certainly the nicest hotel (Portofino was second), but didn't have the same feel of immersion seen in the Disney hotels. We did really enjoy our stay at Wilderness, but for convenience, the Contemporary stay was certainly the best, with its own Monorail stop. The majority of our stays have been at Shades of Green, the first Disney resort, now dedicated to US Military service members, Veterans, and their families. It's less convenient because it has its own bus system to parks and Ticket and Transportation, and also because some of the Disney road construction has eliminated a walking option from Shade to the Polynesian and Grand Floridian. Still, it's a great option for us depending on our park plans and how we include our kids or friends in the travel plans.