Efficacy of prostate cancer treatments options

My dad has just been diagnosed with prostate cancer
He's 52 years of age has no pre-existing medical conditions and is very healthy.

His PSA is 13 so he has been given 3 options to choose from:
Surgery
Radiotherapy
Brachytherapy

I know you can't advise him on which treatment to go for, but I just wondered which is the more effective.

Surgery and radiotherapy (for example, radiation seed brachytherapy) are equivalent in terms of cure rates. Patients with small glands and no obstructive urinary flow may well elect for brachytherapy as it does not involve extensive surgery in the pelvic area. However, patients with larger glands and obstructed urinary flow may be better advised to have surgery.