OverDriver 10, 12 & 16 - I got an Overdriver 10 early in my journey, followed by 8's - these were my go-to's for much of my journey to Div 1. They put out very high damage very quickly, & with practice + finesse they basically never need the 5.5secs Reload.
I have Revoker builds because I NEED them to stay competitive, & they are highly effective but require less skill than the OD's.
I got Storm Racks for same reason but it's Legy Reload Implant is too expensive for me - so for me Overdrivers are the only real alternative to the ubiquitous Revoker & Storm Rack equipped hangars.