Your psa is quite low and the probability before your MRI of it being benign would be well over 50%. I don't know how certain they can be from an MRI but it's pointing at an abnormality, the biopsy will give an answer. Nothing is certain my Gleason Score was increased after the op when my prostate was cut up in the lab, how nasty is that.
We don't know if the doctor has inside information making surgery preferable. Sometimes it's said a surgeon will promote surgery and an oncologist radiotherapy. Although there is little difference between surgery and radiotherapy in outcome for many cases, there are cases where one option is better than another. For example radiotherapy can be targeted more widely than surgery. If surgery fails then you can have radiotherapy but not the other way round normally.
Surgery is offered people fit enough to spend over 2 hours tilted head down at an angle. The older people being treated are more likely to be offered radiotherapy with hormones which can be several months of treatment, although it's non-invasive.
They also say sometimes people are overtreated, I was offered active surveillance if I had a template biopsy, and was told the offer was to not be seen as overtreating. To me it sounded folly as they said it was T2 (T3?) near the edge of the prostate.
The person offering you treatment should be taking advice from a multi-disciplinary team that includes a surgeon and an oncologist, although it might be the surgeon you're talking to.
All the best
Peter