Oh, went back and read a few of your posts, you originally presented with multifocal T1G3, this is a recurrance after 6X BCG. Well, hate to say it, but your urologist is probably justified recommending bladder removal. However, it all comes down to you and how much your willing to risk. If you do have a T1G3 and it was completely resected, you could do one more 6X BCG, and hope that they removed all of the tumor this time. You could try with BCG + Inf. or you could do a bladder sparing protocol with radiation/chemo.
These are all choices you can make/explore if you want to save the bladder. Your current urologist probably suspects that the T1G3 was not completely resected and may have invaded the muscle (i.e. its actually a T2G3). You indicated that one urologist wants to do another TURB, that indicates to me that he is still looking at the possibility of saving the bladder.
Statistically if you have the bladder out while the tumor is still superficial (i.e. Ta or T1) you probably have a 90-95% cure rate, if you chance it and it progress to a T2 or T3 you might only be looking at a 65% cure rate.. Either way you lose you bladder and have all the associated morbidity with that. (Those statistics were just off the top of my head, check with your urologist for the actual stats).
So you can take the safest way out and remove the bladder now or take on additional risk and keep fighting the T1G3 until it either is cured or actually does progress and then you take the bladder out anyway but have a lower survival rate.
Good luck.