I struggled with the same decision a few years ago for my honeymoon. The only way we could afford to stay Deluxe was in a Pool View at AKL (with a sizable discount). Since, our only stay has been at a Moderate. We enjoyed BOTH stays about equally, but they were very different.
AKL: It was our honeymoon, so we had the potential to be in our room more than usual, which is why a Deluxe was important to us. Since we got a Pool View, it was ideally located halfway down the Zebra Trail, which gave us easy access to the lobby, the pool, and the restaurants. We were on the 4th floor, so we were only one flight of stairs down to the lobby if we didn't want to wait for an elevator.
This was our view:
I can see if seeing the animals was the predominant reason why you planned to stay at AKL, you would probably want the Savanna View, but not having one didn't bother us at all.
The main issue I had with AKL was that it was very contained, almost claustrophobic. DH and I enjoy leisurely walks (even after a day at Disney) and that wasn't an option at AKL. Maybe it's better now that there's a trail to Kidani.
The buses didn't bother us at all, but we didn't have anything to compare it to.
Our stay at CBR was equally lovely, but it was very different. I did prefer staying at AKL, but if our budget would only accommodate a moderate again, I would be equally as happy. We chose it, in part, because we were traveling with a 3 month old, and wanted to have places to explore, when we were back at the resort. We still planned on spending quite a bit of time in our room. As common with the moderates, our room was VERY far away from the food court and main pool area. We often got off the bus at the food court and walked back to our room in Barbados - a 5-10 minute walk depending on how fast we walked. I loved the landscape and the hammocks that dotted the beach area. One thing I noticed was that the room at CBR felt bigger than the rooms at AKL. We had king beds at both resorts. The decor (dark with large furniture) and layout of the rooms at AKL make them feel smaller, even though the square footage might be a little bigger. We also lucked into a corner room at CBR, which gave us an extra window. The food court at CBR had a lot more options than Mara at AKL, which was nice.
All said, the next time we stay at AKL, I want to have a savanna view. That is partially due to the fact that I want to try all the resorts once before going back. I think we would be perfectly happy in a pool view at AKL again if our budget and availability required it.
I would not expect an upgrade, but it depends on a lot of factors. I got online a few days before we left on our honeymoon and there was no availability for any higher category for the duration of our stay. It was a long stay during value season that encompassed Marathon Weekend, so there were probably only 1 or 2 nights that were at full capacity, but that make an upgrade, complimentary or otherwise, impossible, unless we wanted to switch rooms.
Book the room you'll be happy with that fits your budget. I don't think you'll regret staying at AKL in a pool view, but it depends on what you're expecting from your stay.