Twindy,
I am no physician and offer the following as a personal observation or opinion. Also, as rupert (and my mother-in-law) suggests, most people post problems with treatment, not successes (though, of course, some do). So, temper your view of the amount and type of negative outcomes.
Also, as with many of the posts here, it is accurate to suggest that there are some downsides to both radiation and micro-surgery. In the end, it is impossible or inappropriate at this point in medical advances to say which methods are objectively better. For instance, some people have had re-growth or new growth from microsurgery and radiation, even if the likelihood is low. We are all familiar with many reports that microsurgery is more likely to further damage/destroy the acoustic nerve and worsen or damage hearing and, possibly, to cause damage (less often the case) to other nerves, e.g. vestibular (balance), facial or trigeminal. Radiation does not remove the original tumor and has the separate very low risk of causing the tumor to become cancerous. If the tumor has proclivities to continue growing (something you will not know until it happens), surgically removing all of it (also not guaranteed because it may be partially removed as a strategy to avoid risking other nerve damage and then re-grow) would prevent re-growth. If the tumor had no tendency to continue to grow after radiation, then radition would completely do the trick.
As I mentioned in my serial posts for my CK treatment, Dr. Gibbs at Stanford informed me that her colleague saw (about a month prior) what was believed to be their first cancerous tumor after CK treatment. I had previously been informed that the odds were placed at 1 in 10,000 or 20,000 and would now, possibly, have to be reconsidered. However, I went through the process anyway and was unphased. After all, everyone knew it was possible, but the statistics still put it in the stratosphere.
I'm sure there are many more comparisons, but I listed some that were pertinent to my decisions beyond the obvious (intially trying to avoid invasive skull surgery). Of course, you will have to decide which approach best suits your tastes.
Good luck with your decision.
Richard