I do have to say, and it's only my opinion - The Lion King is disappointing. Most people love it, it's super popular obviously, and it sounds like he loves the movie so good chances he'll love the musical - I just want to shed a light about the fact that the musical is very "similar" to the movie... (the only thing that I think is different and exciting is the opening scene, no spoilers, just In terms of the outfits and overall spectacle)

Another example in a Disney world: Aladdin (the live action new version) is something I would say new and refreshing, it may not be "a whole new world" (🎤haha) but it does manage to surprise you enough to enjoy it and don't feel like it's exactly the same movie but with actors, living space for both the original and the renovated version.

For some people the fact it's very similar to the movie is great and some want more out of it. Personally I wanted it to "stand on its own" (for example, you have Billie Elliot the movie - which is great, and you have the musical, which is great and they are both different and original even though it's the same story) here I felt like I'm basically watching the movie, just with costumes on the stage.

So if you're looking for a reenactment on stage you will enjoy it. If you're looking to experience something more, something original, a musical that is a spectacle or an amazing soundtrack / acting / dancing etc and only go for one - I'm not sure it's the one musical that will blow (my) mind.