AP scores are not really considered in the admissions process. Further, the important thing with course rigor would be that you could check ‘most rigorous available’. Whether that means 20 APs or 2 does not really matter to highly ranked schools’ adcoms, as they have stated. So, OP, it will not really set you apart as much as other selective awards do, because for these you ‘win’ the category as long as you take as many rigorous courses as your school allows.