I can offer opinions on tours we have done in the past few years.
AK: Wild Africa Trek... SENSATIONAL and worth every expensive penny. Our family of 4 (two teens and 2 adults) did this in November 2015 and loved it.
Caring for Giants....very good. My two kids and I went on the second day it opened and it was awesome. It is only an hour long, but they pack a lot of great information into that time frame.
On my wishlist: Starlight Safari...very limited availablity...happens once a night at 10:00 PM and is open to all, not just resort guests. Which is sort of a bummer...I have been trying to book this for the past 6 months with no luck.
EPCOT: Behind the Seeds...very good...we did it twice and had a different experience due to tour guide interaction. We really enjoyed both of them though...just in different ways.
EPCOT Seas Adventure- Aqua Tour...very good. Awesome guide and so much great information available about care, water systems and integration after breeding.
Magic Kingdom: Family Magic Tour...alas this one was a fail for our family. The description indicates it is okay for Teens, Tweens , kids and adults....not for us. My two were the oldest and though the tour guide tried hard, the majority of the participants were under the age of 10.
Hollywood Studios: Considering the Star Wars tour...but I have spoken to CM's who indicate it is not really that much of a big deal considering that much of it could be done on your own with good planning. My two are also too old for Jedi Training, so there is no benefit to us there.