The official concordance maps a 1500 to 34. Specifically the 2nd of 4 that map to 34, so about a rounded 33.75.
Your ACT superscore is a 33.5 rounded to 34. They are pretty equivalent, but the SAT is marginally better, especially as it’s one siting.
https://www.act.org/content/dam/act/unsecured/documents/ACT-SAT-Concordance-Tables.pdf
Sounds like taking the SAT again makes sense, over another shot at the ACT.