S&S or RevTech??

Hi together, drive a 98 ́road king with Evo and injection. I’m after more power. HD tuning doesn’t convince me. A new engine must come from..just what to choose?? S&S and RevTech have great deals with TüV..who has experiences? Gibs qualitative differences? Recommendations from you? And where should I order it? I hear so much nonsense in the so-called scene in Munich…rejoice in honest opinions, lg and ride safe…Phil from Dijon /France currently in MUC