What factors makes a cancer radiation therapy a success?

Does the age of equipment matter at a state licensed facility? I've been recommend SBRT (stereotactic body radiation therapy) to attack and kill a cancerous nodule on my lung. It is only about 8 mm in size which my pulmonologist didn't expect to find as a cancer during bronchoscopy to biopsy it. I suppose it would be combination of how many lung cancer patients the radiation oncologist treated, doctors area of interest/specialty, the number of years of experience, doctor to patient relationship, and I suppose how old is the radiation equipment should matter to some extent. Should have to go to a facility where the doctor is expected to have newer equipment, but a bit less experience with lung cancer? Any thoughts?