For 2 years I tested out two different grease gun fittings... the LockNLube and the VARSK Grease Gun Coupler. Which is best? Are they any better than the stock fitting?

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Link to my personal information and other preaching and teaching examples:
https://drive.google.com/drive/folder...

The gear I use is:
Camera DJI OsmoPocket
Camera – iPhone X using the MoviePro app.
Camera – GoPro Hero 4 Silver
Camera Parrot Bebop 2 with the Skycontroller 2.
Camera – Polaroid CUBE
Wireless Mic Movo 2.4GHz Wireless Lavalier Microphone System
Wireless Antenna Inamax USB Wifi Adapter 1200Mbps
Video Editing Software – Wondershare Filmora 9

Our Rig is a 1999 Discovery 37V with:
2000 Freightliner XC Chassis
5.9 ISB Cummins 6 speed Allison
Bluefire Engine Monitor w/ RCA Cambio 2in1 10” screen
SafeTPlus Steering Stabilizer
Garmin RV 770 NA LMTS
STEHL Tow Dolly, Chevy Impala (2 down)