I think this higher dose rate is called Stereotacic Body RT, SBRT for short. It seems to be being offered more often now than say three years ago when I was irradiated.
If has been suggested that it is as effective as more conventional EBRT, but has fewer side effects.
It is not as tried and tested as EBRT, so in the long term it may give better or worse outcomes than EBRT. It would be unethical for the medics to offer you a treatment which is worse than the best standard of care available, so it might be OK.
I being someone who likes to advance science, would take the latest treatment on offer, the more people on the new treatment the sooner the medics will find out if it is better or not.
Also the fewer trips to hospital the better.