Cdmeggers has given you some great information to start from.
Surgeons focus on installing the electrodes. The audiologists are the ones with the experience and exposure to what happens after the implant is turned on. Some surgeons do have a stake in one particular company so they may push it over others.
It's very important you do real research to be sure about your decision. I am pretty sure if you start digging and fully understand what you are reading.. you are going to be shocked your surgeon made that claim at all. Frankly, they install the implants. It's the audiologists that have the direct exposure and experience with programming them and seeing what happens after you turn them on. When it came to my surgeon, I was more interested in his expertise in implanting and what kind of incision he used. He had nothing to say on which one to choose.