My neurotologist gave me the choice of translab or retrosig and I chose retrosig. My reasoning was that I still had hearing with decent word recognition (although it was diminished hearing) in my AN ear and I wanted to at least try to save it. I was told the odds of that weren't good, but I couldn't see just doing translab and automatically ending up SSD. I would have always wondered if my hearing could have been saved.
The odds weren't with me, my AN was wrapped around my hearing nerve which had to be sacrificed in order to remove the entire tumor. So, basically I took a gamble and I lost - but I've never regretted it.
Despite what some experience, I've never had headaches that can be attributed to my AN surgery nor did I end up with facial paralysis (had slight paralysis a day or two post op that a single dose of steroids cleared up).
Everyone is different and docs can't guarantee you anything, so you need to pick the approach that gives you the most peace; that you won't find yourself second-guessing post op.
As for a hearing aid potentially helping you, I'm not sure if it would or not. That would be something to ask your doc or audiologist. I can tell you that I have a BAHA and I couldn't live without it. And, you don't have to be entirely SSD to use a BAHA. Candidates are evaluated on a case by case basis, so it might be possible you could have a BAHA with diminished hearing if a hearing aid was out of the question.