Best Way to Scan a Java Project using only Ant (no Maven)

We get a lot of Java projects that use Ant as their build tool. These projects however, do not use Maven. I'm looking for guidance on the best way to scan these projects. Would using ScanCentral - SAST with "-bt none" work better than a local SCA scan with or without build integration. There are several choices and each returns very different results. What is the best scanning procedure for the cases? 

Thanks!