Joanne,
It is a given that different doctors will address conditions differently. As for BCG usage, there has been quite a range of different treatment schedules and plans applied to and reported by people posting on this site. Some doctors take a more aggressive approach than others.
I like the aggressive approach, but then again I have both low and high grade cancer. My first urologist was a wait-and-see guy. I replaced him.
Personal medical history is often a factor a doctor considers when suggesting a course of action, as well as the individual patient's preferences.
BCG does have side effects that can vary by individual from mild to debilitating. The doctor and patient need to work through any problems and balance the benefits and side effects. (I am hit hard by BCG, but I have no intention of discontinuing treatment)
I offer a link to another article, by the highly respected Dr Lamm on BCG use and outcomes. It is a 2006 article and includes Ta and T1 results out to 6 years. Of course, statistics do not apply to any one individual.
www.europeanurology.com/article/S1569-9056(06)00142-4/fulltext/improving-patient-outcomes-optimal-bcg-treatment-regimen-to-prevent-progression-in-superficial-bladder-cancer
I think you have made a good decision. Remember though, I like aggressive. BCG is intended to activate up your immune system to help clear/control any cancer cells. To me that is a good thing. The other option is to wait and see IF there is more visible cancer to treat at your regular checkups. Tough choice to make. The best thing is that you know about the cancer and it is being followed along - now you have choices.
Best
Jack
PS I have researched the medical literature heavily since my diagnosis. I have chosen my path based on my preferences and the best medical evidence I can find. Everyone is different and may have better options.