Hi Teddyedward,
In both cases I suggest you take along a set of written questions to ask, which can be drawn from the Prostate Cancer Tool kit, your and your partners concerns, any other reading you've done etc. Then, at the appointment, write down the answers there and then.
I had a general set of questions and then specifics for each type of treatment, surgery vs radiotherapy (incl. breachytherapy, which I too was offered). After each appointment I then transferred each answer to a spreadsheet so I could compare (sorry, working in IT, I'm a bit of a propeller head in this respect).
In terms of general (non-treatment) questions, these related to the diagnosis e.g. agressiveness, tumour size, likelihood of spread etc. By asking the same question to each consultant gave me a level of reassurance.
In terms of specifc questions these related to the procedure, potential side effects, the surgeon's track record and of course chance of success.
If you have a partner / friend you may want to ask them to accompany you to help fill in any blanks when you get home.
Good luck with the treatment you choose.
flexi