I apologize for bump an old topic from the dead, just have a few interesting observations from personal experience, maybe someone will need this information in the future. have both. Stauns are nice and easy if airing down to the same pressure every time. You can vary the set pressure of two or four of them but that kinda negates the "ease of use" benefit of them. Be sure to crank the set screw down hard and maybe mark a line of paint to indicate non-movement.
The ARB deflator
https://mechanicguides.com/best-tire-deflators/ is nice if you often vary the pressure. No chance of losing the valve stem but deflation will be slower than just pulling the valves.
The quality of the actual valve-core puller is good. I believe this is the patented part by Burkey and is shared by all the various brands. I am not really pleased with the rest the pressure gauge on the ARB Looks cheap and the protective rubber cover doesn't even fit snug. I have not had the opportunity to compare with the other brands. But I'd like to see a currie or accu-gage version. I have one of the regular dial type accu-Gage's gauges that seems to be of better quality. But perhaps these are all the same.
The Stauns have two problems;
1)They are never set for the pressure I want to run today.
2)They are all over the place on what pressure the actually shut off at. The ambient temp seems to change the shut off pressure, worse it does not seem to be uniform across the set I have.
With the Terraflex style, I put one on, wait a minute and install the rest. Every minute or so I check the first one. When it gets close I release it and the rest then air them down one at a time. It works really well, plus I can lend one or two out to friends and still get aired down pretty fast.
The other advantage is that at $10 I can afford to have a set in every truck, unlike the Stuans.
.I like to watch YouTube videos of a similar subject when I'm looking for information about the right product. I hope this helps someone in the future. Good luck!
https://www.youtube.com/watch?v=6kul4YMcVpU