Hi IRW 65,
Sorry that you find yourself here. There are some very knowledgeable people here and I hope some of them will reply more fully to your post.
Your prostate seems quite small at 15cc. This might mean that you could have successful treatment with very precise Radiation Therapy such as Brachytherapy.
I was diagnosed 12 months ago and was a Gleason 7 (4+3), T3a with Cribiform Morphology. Prior to diagnosis, I had frequent urination. I wasn't offered Brachytherapy because the cancer was too advanced. I was offered Surgery or Radiotherapy with Hormone Therapy (HT). As I didn't fancy the HT, and they didn't recommend having the Radiotherapy on its own, I opted for the surgery, which took place 11 months ago at The Christie.
I've had incontinence issues and erectile dysfunction since the surgery. I've had some improvement in my incontinence level, but no progress so far with erectile dysfunction. I've been prescribed a vacuum pump, Cialis 5mg and Alprostadil injections, but the results are underwhelming. However, some people are able to report being fully continent almost immediately after surgery and have better erectile functioning after 12 months than I've experienced, so I may not be typical. The fact that you have no current symptoms (whereas I had frequent urination before diagnosis) might mean that you would have a better outcome from surgery.
It's a big decision to have to make. There is a book called "Saving Your Sex Life: A Guide for Men with Prostate Cancer" by Dr. P.J. Mulhall. It's available on Kindle at a reasonable price. Otherwise, it's a very expensive American import. If you have time to read it before having to make a decison, it might be worth a read. It's about 10 years old, so some treatments may have improved since then.
Best wishes in whatever you decide to do.
JedSee.