Happy Anniversary... we're creeping up on #24.
If you want giraffes, then request the Sunset Savannah.
The Pembe Savanah does NOT have giraffes. It is a smaller savannah (relatively speaking) and there is not enough room for them to roam. The Pembe savannah has its own unique set of animals and birds.
I have stayed in rooms on different stays overlooking both savannahs. I enjoyed them both. The Sunset savannah is bigger and will have some of the more traditional animals - giraffe, zebra, ostrich, wildebeest, cranes, etc.
When you are at the swimming pool, you can go to the far end and there is a nice overlook of the Pembe savannah there. They have nice gazelle, river hogs, and the okapi.
Either one, you won't be disappointed, but if this is your first time, definitely go with the Sunset savannah... at least that's my opinion.
Rich