I went on two Studio tours- WB and Paramount. This tour is perfect if you want to really look behind the scenes of film making. I was on the Deluxe tour, and we got to see the costumes warehouse (never seen so many clothes in one place, not counting stores). We got to tour the backlots (including the Jungle backlot), see the Friends fountain, and even got to walk through the sets of All American: Homecoming, that films at the studio (no pictures for that). We walked through the Props warehouse that held iconic props and set decorations from films from The Maltese Falcon, to Casablanca, to Batman Returns. For the Deluxe tour, we got to eat in the Executive Commissary (and turns out we dined in the same room as the new head of the studio and one of the co-heads of DC Entertainment). And our guide was very knowledgeable and full of facts about the studio and the backlot.
After the guided tour, you have a self-guided tour showcasing costumes and props from the DCU and Harry Potter, along with an exhibit showcasing the history of Warner Brothers Studio. All in all, it was an incredible tour, and if you go, splurge for the Deluxe tour. It's worth the extra money