Hi Gary
I'm sorry to read your news and you've had to find this group, but you'll find a huge amount of support and knowledge on here.
I'm sure everything's a blur today and you'll need time to take it all in, but don't rush into anything. You have more than 2 options. Speak with your nurse and ask her for all the options. Treatment options are also on this website. Not all treatments are suitable for everyone and some are dependent on the position of the tumour. Some guys choose AS, but you also have to be in the right headspace for this option. Robotic nerve-sparing prostatectomy, even with nerve-sparing techniques, some men may experience erectile dysfunction after surgery, and recovery time can vary. Do as much research as possible and explore every avenue.
Unfortunately, as I am sure you are aware, its not a "one size fits all" for prostate cancer and as Adam said above, with your diagnosis, no-one will specifically tell you what to do, but they should give you all the options that could potentially be suitable for you.
Wishing you all the best!
Seb