I agree with Survivor regarding biopsy vs. possible actual state of the prostate pathology. Often pathology shows higher grade after prostate is removed and examined. There are cases when grade is lower upon examination, but I can recall reading that scenario maybe once or twice.

If you decide to do AS please make sure to have biopsy again in 2 years, the latest. My husband had 3+3 in just 3 cores and in 5 years developed 4+7 with aggressive components of cribriform and IDC ! If he had biopsy every 2 years perhaps 3+4 would have been discovered on time and we would definitely choose treatment at that time, no question about that. With 3+4 you have so many options for complete cure with excellent results, vs. 4+3 with cribriform and IDC.
Yes, seek all of the opinions but be very proactive and push for what you want to do, we wish we knew more about correct AS and not rely on our urologist for advice and care. On the other hand, you are already talking to doctors that are inside centers of high competence and I am sure that you and your doctor will choose a good and successful path forward.