SA.
Without it, you're just driving your a/c. ACM for 1 v 1's because you don't need to worry about anyone other than your single opponent.
From Top Gun:
Charlie: "What were you thinking? you made an aggressive, vertical move and you should have split-S'd"(ACM)
Maverick: "if you think, you die
Viper: "It's better to select zone 5 (full, military speed, afterburner) and escape and save your a/c than to push a bad position (SA)....you made a bad choice".