Hi, Jody. Welcome to the Forum.
I had retrosigmoid surgery, but not with either of these doctors (who by the way, both have stellar reputations).
I had my surgery locally, because I found very experienced, well-qualified doctors right in my own backyard. Although some travel for surgery, it's really more of a personal choice than a necessity unless you have no "good" local choices.
I had decent word recognition going into the surgery - although my hearing was "diminished" - so I chose retrosigmoid over translab. It was my personal feeling that I wanted my docs to at least try to save the level of hearing I had and if they couldn't "oh well". My attitude was "nothing ventured, nothing gained; let's give it a shot".
During the surgery they discovered that my AN was wrapped around my hearing nerve (something that isn't evident on an MRI) and they made the decision to sacrifice my hearing nerve in order to remove the entire tumor. Although I was sleeping at the time and couldn't give my docs my two cents worth, I whole-heartedly supported their decision.
Everyone's AN Journey is unique, but I have had no headaches from retrosigmoid and only had slight facial paralysis for 1-2 days post op; a dose of steroids cleared it up.
IMO translab vs retrosigmoid doesn't mean your docs can or can't remove the entire tumor. My tumor was removed "100%", however, it's important to note that I still have a 1-2% chance of regrowth. Even when docs say they removed 100% (and strongly believe that) they can be wrong. Even one cell left behind is enough for regrowth; and cells can be small and not easily seen.
If I had to do it all over again, I still would opt for the chance (as slight as it is) of saving my hearing through retrosigmoid, but that's just me. You should do what is best for you (what you are comfortable with).
Nine months after my AN surgery I had a BAHA implant for my SSD and it's ended up being one of the best things I've ever done. If you ever find yourself considering one, please don't hesitate to ask me about it. I'd be happy to answer any questions you might have.
Best,
Jan