My son is currently a junior. He is taking Calc BC along with AP Physics, AP Gov’t and AP Computer Science. Similarly to your son’s school, his schools only allows AB or BC. If a student was on the advanced math track, they tend to take the BC route and not AB. I saw you noted two options for the math track, AB then Stats, or BC then Honors Math Topics. Is there any option to take BC then Stats senior year? Or start in BC but drop down to AB if it warrants sometime during the year? Maye that could alleviate some concerns. I would agree that teachers make a huge difference and either way your son will have a good foundation.