Bagsyboy, there isn't a definite recommendation because the published clinical trials suggest all treatments have roughly the same success rate. The main difference is the profile of side effect risk, which in turn depends to some extent on the patient.
And you need to remember that a 10-year success rate is reporting on the treatment regime from 10+ years ago, there have been improvements in both surgical and radiotherapy technology in that time.
Andy62 highlights a particular example. For many people undergoing radiotherapy their issues with short to medium term side effects really result from the hormone therapy which is taken in parallel. The new "hypofractionnated" approach (fewer sessions each of higher dose) seems to give a good success rate without hormone therapy or its side effects, but we won't know for certain until another 10 years.
Basically the younger you are (say under 60) the better your chance of good recovery of functions after surgery, while radiotherapy (which tends to have lesser short term side effects but a longer term - 20+ year - risk of cancer) is often recommended for those who are older, say over 70. You are in the middle!
In the end it comes down to your decision given there isn't a "best" treatment. You need to talk to your doctors about the specific chances of success and risks of side effects in your case, and take into account the treatments offered and how up to date they are. (In particular, does the hospital have the latest generation of radiotherapy machines, or surgeons using the lates techniques). Members of this forum are all experts on their own experience, and that is valuable background for you in working out what to do, but none of us can say how it will turn out for you. Have a good delve around the forum to lean from all our experiences, and I am sure currently active members will be very happy to answer any questions you have.