Brachytherapy versus SARB versus external beam radiotherapy

Hello again, have been on this post a few times since about 2014 for my husband. Well it is down to four options. I know the decision is ultimately my husband's but we would like as much information before deciding.
PSA 9.87
Fusion biopsy (after two other biopsies that couldn't detect ca)
Adenocarcioma (acinar) primary gleason pattern: grade 3, secondary gleason pattern grade 4 Number of cores positive: 1
Number of cores: 6
Total linear ml of ca 5 mm
Total linear ml of needle core tissue 15 mm. All else being negative (periprostatic fat, seminal vesicle, lymph-vascular, perineural.
The specimen is approximately 60% Gleason 3 and 40% Gleason 4.
Of course the other option was radical prostatectomy but the urologist said at his age (67) and the staging of his cancer, some form of radiotherapy would be equally as good. Radical nerve sparing prostatectomy is not out of the question.
Went to oncologist today at Cancer Clinic and he said my husband could almost be on active surveillance but if we wanted to do something about it, brachytherapy was his choice. He did offer SABR but only as a clinical study - half of patients would be chosen for SABR and the other half external beam as they have just started SABR in our province (clinicals only).
I have been following this site for a while and I appreciate all of you who have shared their experiences. What a wonderful life line. I have researched and researched but it is so nice to hear from men who have actually, unfortunately, had to go through this experience. My heart goes out to all of you... Thank you for taking time to read this post...

From what I can tell my reads were similar to yours with a G 3+4. I had LDR Seeds and am doing well 3 years later. As TA has mentioned SBRT and HDR are also excellent choices. I chose LDR because I was back to walking miles the next day after the procedure that lasted the better part of a morning. My SEs were minimal with only a decrease in ejaculate the remaining setback. Cure factors are similar for all of these options and would suit you well. What ever your choice I wish you the very best and keep us posted.

Hi Tall Allen, They only offer low dose Brachytherapy on Vancouver Island, British Columbia. We like the sounds of SBRT but unfortunately he would only be offered this as a clinical trial, and it might end up not being the SBRT but the external beam radiation therapy. Wish we did have a choice, but then again I don't know how much experience they have had since they are still in the trial period. Still more researching but my husband is opting on the side of low dose Brachytherapy.
Thanks again for all your help. You people are amazing!!!

I would ditto what JNF said. I would opt for the certainty of the LDR-BT rather than being subject to whatever treatment the trial assigned to you. If you were willing to travel to Vancouver you could still consider SBRT or HDR-BT.