We had this situation this year. D had a 36 ACT and a 2040 SAT. Great and so-so. Stanford and I think Georgetown required all scores. I could be wrong on Georgetown. I can’t prove it but my sense is that the colleges that saw both her SAT and ACT scores did not simply take the ACT, and build the strongest case possible for her admissions. I think colleges will look at all the data available to them - good and bad. That is just my opinion but unless you absolutely must send a weaker SAT score - don’t. Read the colleges standardized test policies and interpret them in the way that makes you look best