Low dose brachytherapy long term side effect risk

My 55 year old husband has Gleason 7 (4+3) posterior peripheral T2a prostate carcinoma with PSA 5.2. 1 ml more or less volume tumour. PSMA pet scan did not show evidence of spread (we realize this can be false negative). We are trying to make decision on radical prostatectomy versus low dose brachytherapy as those are the two options most recommended for him. He is trying to chose and one big focus he has is on the long term side effects that will affect his general quality of life. Obviously if treatment not curative and further therapy with radiation, etc is needed then that is separate issue as we were told cure rates are similar for both RP and LD brachytherapy for his type/size of tumour.
Long term urinary risks present with both options however surgery more likely to be urine leakage issue whereas brachytherapy’s long term urinary risks appear to be more urgency, reduced stream/outflow, perhaps pain or bleeding from radiation induced cystitis. Rectal inflammation risk present long term with brachytherapy, not with surgery. Erectile dysfunction appears to be worse outcome with surgery than LD brachytherapy long term (I believe long term risk equal with external beam versus RP but less with LD brachytherapy, is that correct)? Very tough decision to make. He is reportedly a very good candidate for either surgery or LD brachytherapy. So comes down to this vague feeling choice based on perceived risks and if one of the lower chance long term side effects does occur, how manageable it will be. Just wondering if anyone has thoughts or more info on outcomes or how to make this choice. Are there statistics out there? Or are risks so individualized to age, tumour characteristics, general health etc that no further info out there to help. We seriously feel like we are in a coin flip situation . . . kind of scary . . .
The other info is that surgery can happen in 10 days whereas 2.5 month wait for brachytherapy locally then the tumour damage/control from it occurs over the following six months. That delay must increase risk of spread . . . not sure if the time delay significant for a Gleason 4+3 or we shouldn’t worry about that factor? Biopsies were back in beginning of September . . .