I've been grinding out a min of 20 levels an evening  since the beginning of the zombie event,  just to close the gap on my 12k milestone.   This is what I've been using for open world, missions and matchmaking.  When I'm in the mood to farm control points  (20 levels in around 90 mins) I only run 4 directives and use a pestilence build. 3 piece lengmo w/ backbone,  petrov chest w/ glass cannon, overdogs & turmoil kneepads. All red, all crits. It slaps.

  I have over 50 builds on 4 characters, and only a few are the same so,  I don't have any favorite builds, albeit a few definitely get used more often.  This one though.... it's rising to the top. It performs well in all conditions.  Sometimes I switch the secondary, Emeilne's Guard for the backfire.   Don't get me wrong, it's no chest striker backfire build for incursion or frenzied gr9, but the way its been treating me over the past weeks......I think I'm starting to catch the feels.

Lexington / killer

Emeilne's guard

Tempest

Hollowman mask

Equilizer chest

Salvo holster

Unit alloys BP/ bloodsucker

Overdogs

Fox's Prayer

all red, all crits

I have the backpack with vigilance and unstoppable force ❤️ as well.  UF gets the crits up nicely🤩  bloodsucker lets me run backfire  though and occaaionally go ham. 

Build- 5 directives