Sunset savanna has giraffes and zebras, Pembe, the smaller savanna at Kidani, does not. Most prefer and request Sunset and getting it has a high chance of being granted since more than 80% of the savanna view rooms at Kidani have Sunset savanna view.
There are many good views along Sunset savanna. The more important factor is distance of any room to lobby, pool, and buses. The Kidani building is close to 2/3 mile long, one of the longest single hotel buildings in the world (and I mean on earth not just WDW). As a result many make requests to hopefully limit the distance from room to lobby, pool, and buses.. My preferred two requests are for a room either close to the Rafiki elevator (which provides shortest trip to pool and striking distance to lobby and bus stop) or close to the Timon elevator (which puts you very close to bus stop and striking distance to lobby and pool). Both those areas also have very good animal views.