Clover - welcome to you and your partner! Its the club that no one wants to join but everyone is friendly.
If you have read through the forums, you will know that each person needs to meet with various care team, read up on the side effects, and make a decision for themselves. We all have reasons for choosing the treatment (or non-treatment) option that we did.
I was (and still am) an active 55 yo. I read up on outcomes from each type of treatment, then when I decided on a treatment, found a facility that treats A LOT of them, with my chosen treatment. I did not want to be anyone's practice patient.
I chose Gamma Knife at Mayo Clinic in MN. Dr Link does both surgery and Gamma. Cyber Knife is not an option near me. If I had to so surgery, it would be translab, as I went from 95% word recognition in January to no hearing in April, so I am now SSD. I wear (hearing aids) a transmitter on the bad side which feeds into my good side. Everything sounds from the left, but I can pick up things I would not be able to without wearing them. The tinnitus is fairly bothersome at times. It interferes with hearing with or without the aid. Please be patient with your partner if this is their situation. Mine has been a trooper through the whole thing, and never gets frustrated when having to repeat things.
You have a group of folks who understand your situation, and I would ask the you or your partner keep us informed on how your journey is going!
Best of luck!