If they are still offering the Up Close With Rhinos, tour, you probably should read some reviews and consider that one.
https://disneyworld.disney.go.com/events-tours/animal-kingdom/up-close-with-rhinos/
I liked the Behind the Seeds Tour -- but I am an adult who likes to garden. If your teens are not into gardening, I think they would be bored.
I liked the Caring for Giants Tour -- but I like to take pictures of the animals in the park. If your teens are not into taking pictures of animals, I think they would be bored. For most of this "tour" you just stand in one spot and look at the elephants. Also, I did this a year ago, when Baby Stella was that much smaller so the pictures would show more of a contrast between her and Mom. Also, please keep in mind that when I booked the tour I was warned that you might not see any elephants! The elephants are free to wander into the area near where you are taken for the tour. They also are free to not wander into that area. You do not get a refund if you don't see any elephants because they add in an educational factor where a cast member talks to you. But I found the talk part dull. I also found that cast members in other parts of the park were repeating what the cast member told us, so it wasn't like it was info you could only get on the tour.
If you are guaranteed to see a rhino on the rhino tour, I would consider that one.