Hello,
Here is my take:
Value rooms will ALWAYS be at Jambo house... but IMO, I like Jambo house better than Kidani for the fact that the resort has more amenities...Quick service, more restaurants, activities, etc.
So, if you want and/or are willing to stay at Jambo instead of Kidani, then the value rooms are an EXCELLENT value.
What defines a value room is that it is physically 3 feet shorter than a normal sized room. A value room has a 45% chance of being a pool view, a 45% chance of being a savannah view and a 10% chance of being a parking lot view.
I took a trip in december to AKL Jambo house and stayed in both a value sized room and a normal sized room. I honestly don't feel like the extra space in a normal rooms adds anything to the room. The only issue I had with space in the value room was that there wasn't any place to put a suitcase in the master bedroom, but I always put the suitcases by the studio/1-bedroom connecting door anyway. The extra chair in the bedroom on the normal room won't ever be missed. Other than that, the extra space just seems to spread stuff out a bit. The room doesn't feel any larger, nor did the value room feel cramped.
If I were you, what I would do is just book the entire trip as a value room. You may luck out and get a savannah view anyway and you'll save a TON of points. If you don't get a savannah view, then there are TONS of places all over the resort for viewing the animals. In my opinion, the missing space won't even be noticed.