Radiation therapy has a cure rate about the same as the cure rate for surgery, but no surgical risks. There's no risk of bleeding. You don't have to stay in the hospital. You'll recover faster. Daily activities can usually go on during the treatment.
Incontinence is extremely rare afterward.
About one half of patients become impotent within 2 years of having radiation therapy. Many men feel very tired at the end of the treatment period. Serious complications are rare. However, a degree of uncertainty goes along with radiation treatment. Since the prostate gland and the lymph nodes are not taken out, the doctors can't tell the exact size of the tumor.