I have received a proposal from an operator who is a specialist birding operator, and one portion I am unsure of. It includes spending several days at Ndutu, but then moving on to Mbalalgeti, instead of something in the central Seronera area (as other proposals have suggested.)
Here is how he justifies it.
"Mbalalgeti has access to the Grumeti River where the resident game is as good, plus here we will also find the best hippo and croc pools of the Serengeti. The birding is tops, the landscape is totally different and again, great for photography. ...after our long stay at Ndutu, the plains and hills of Seronera will no longer be a novel subject to photograph, hence change of habitat will bring new subjects, species, new landscapes and opportunities."
He also points out we will spend a day driving through the Seronera area to get to Mbalalgeti, and would cover it that way.
Thoughts? Certainly it would be away from the crowds at Seronera and experience something a little more remote. But I do not find much information or trip reports of folks going to that area at all (which is part of the appeal, of course, but usually an area is popular at a certain time for a reason.)