Mr. Cynnamin and I are headed back to Botswana next April. We've stayed at Little Mombo, Kings Pool and Jao, and their tents and camps are extremely luxurious. All our camps on the previous trip and April 2013 trip are from the WS Premier Camp collection, and I have to say that the pictures on their website don't do justice.
I think the food at Singita are probably higher quality because they are more accessible unlike Botswana where the camps usually get weekly delivery. The food was still very good, especially at Kings Pool.
You can find great deals if you are going with all Singita or &beyind, and WS also has their Greenseason deal at the moment but they only include the Classic camps. You also need to find a preferred agents referred by WS. Let me know if you are considering WS camps. I know a great travel agent who always comes back with the lowest quote for the WS itinerary.