We stayed with mostly Asilia lodges for our Tanzania safari. Absolutely loved it. We chose Asilia because they have mobile luxury tented camps that move with the migration. The dinners were beyond amazing and better than many high end restaurants we've been to. We also opted Asilia over &Beyond Under Canvas because we could have our own private guide and driver. It sounded like &Beyond would be in a group which could vary from being alone or with others based on occupancy.
The only negative about Asilia would be the boxed lunches that they offer if you go out all day on a game drive. They weren't bad and better than others we saw, but certainly not equal to a lunch you'd receive dining in person at the camp. We later realized it was far better to go out early w/ a packed breakfast, return for a gourmet lunch, take a nap, and game drive in the afternoon.