My daughter had s similar choice (add in Cal Poly SLO). This weekend during Cal Day she committed to Berkeley. She came to the conclusion that she’d be stressed out anywhere and it might as well be at Cal. While she loved UCLA she has an anti-LA bias. Some advantages of UCLA are guaranteed dorms for more years (3 vs 1), and better food. UCB advantages are slightly better academic reputation, better mass transit, cheaper rent. In addition Berkeley has more flexibility in their meal plans and they allow students to dine closer to their classrooms.
Berkeley does have a LGBTQ themed section of the dorms that may be a good option though I don’t know what sort of guarantee you have.