The 3 brands all can produce great results if you work at the rehab. There might be some differences I’m don’t know about when it comes to Meniers. Only your surgeon and audi can address how that part will effect the choice.
Reading https://cochlearimplanthelp.com/ helped me a lot when I was deciding. It is an impartial source of info. I also contacted the reps from Cochlear America and AB. You can also join each brand’s facebook group and ask questions.
I choose Advanced Bionics partly for the seamless integration with the Link HA, bluetooth without a device and the MRI compatible internal magnet. There is a replaceable battery compartment for emergencies. I also liked that if my second ear gets worse, I can try using a link HA before I jump to a second CI.
I just passed my 1 year anniversary of being activated and have no complaints. My word discrimination at one month with both CI and HA went from 36% to 100%. With just the CI, it went from 16% to 80%.