Favorite Scene: It's very hard to pick because I have a lot of them, but one of my personal favorites is We Are One. To me, Simba and Kiara's father-daughter relationship works well here and it touches me because they remind me of my relationship with my dad. Some might say "Oh, but Simba was too soft on Kiara quickly," but I really do not care. The song is great, the scenery is beautiful, and overall, has a good message.
Least Favorite Scene: Every scene where Timon and Pumbaa appear. I'm sorry, but in SP, they were REALLY annoying and kinda unnecessary (but of course, you can't just vanish them completely since they went back to the Pridelands with Simba during the first movie and stayed there with him and his family). Also, like most people, Upendi. It's not that I hate the song or anything like that, but just the scenery. I find it very cheesy, especially the animal congo line. I don't like looking at that too much. I feel that the Upendi scene looks too baby-ish/cartoon-ish, IMO. Another part of the movie I found cheesy was when Timon took Pumbaa's tail and using it like a gun. It doesn't make any sense because I do not know how on Earth they can know how a gun works since they are animal characters and not humans. Other than that, nothing else and I still love the movie as I always have.