Personally, if you are doing the WB studios tour and have been to Orlando a bunch, I’m not sure you need to do USH. The only truely unique attractions are the Studio Tour, Secret Life of Pets, and Kung Fu Panda 3D +/- Fast and Furious Hollywood Drift (if it’s open, and Orlando will get this in 2027.) I love experiencing Jaws and Earthquake as much as the next guy but you’re already doing a studio tour, I don’t think you need to do 2. However I only say that because I did it in fall 2024 so let me tell you what I did.
I suggest booking 2 nights in Burbank at the start of your trip, the Universal Hilton is walking distance from the park and Citywalk, I did this the last time. On arrival day I checked in, had dinner at City Walk and went to bed. The following day I had a day ticket to USH, and did a RIP tour for HHN. Do not expect the same quality as Orlando in Hollywood, their houses are much more rudimentary, limited to one story in all rooms but the facades, soundstage houses do not have the giant black curtains (as you approach you can see the top of all the scenes which means light pollution and sound pollution.) I’m sorry to say, I felt like HHN Hollywood had non of the positives and all of the negatives of HHN Orlando (I litterally attended both events less then a week apart and went to Orlando first so your mileage may vary.). The following morning I went to do the WB tour (which I splurged and did the gold tour with a small group and got yo eat in the commissary which I felt was worth it.) Then checked into Anaheim.
If you are Halloween people I would highly recommend you check out Knotts Scary Farm. I think it’s a far better event then HHN Hollywood (and the only other event I would say can match/challenge HHN Orlando for the king of Halloween crown) while it lacks the IPs, more polished sets and repeats mazes for a few years (not that you would care about the latter as a first timer) it gains in having a cast of screamsters who are allowed to improv and do more then just trigger a sound effect. Their scarezones are the best in the business, they invented them here, the Ghost Town scarezone has nets over the pathway to trap in fog so that it gets so thick you sometimes can’t see 3ft in front of you, and all zones are filled with sliders (monsters wearing knee pads with metal surfaces who will sprint, dive on their knees, and skim right by you with a shower of sparks. It’s a nice park during the day as well (Scary Farm is an extra ticket) and if you chose to make Thursday the day you go, the park will be dead during the day. I’ve been to So Cal a lot and am a park junkie (I’ve been a DL AP/MK holder 4 times) I’ve gone to USH twice, Knotts over a dozen times.