SBRT versus IMRT for BCR after prostatectomy

I am 72 years old and had< .02 PSA for two years after my prostatectomy. My PSA went up to .05 then jumped to .15. My onocologist recommended 35 IMRT sessions and I got a second opinion which agreed with radiation but would do 5 SBRT sessions to the pelvic and lymph node area. I am trying to find out advantages and disadvantages of each one.
My decipher score was .92 and I had two locations with no margins and EPE. I am currently on Orgovyx and am on hold since 3 spots of low emissivity showed up on psma/pet test. They are going to take a second test in 10 weeks after being on Orgovyx and if the emisivity stays the same they will determine it is non cancerous and I will go for radiation. If the emisivity disappears then it will be considered cancerous. I do not think the spots are cancerous. My second opinion recommended doing an MRI also. I would appreciate information on SBRT and IMRT for the reoccurence at 3 years. Thank you everyone for all the information I have learned from this site in the past.