I've standardized on Milton "V-style", seems like a 1/4" NPT fitting that flows like a 3/8" NPT fitting.
The walls of the male fittings are very thin (it's basically a hollowed-out high-flow standard 1/4" fitting), so I think it's best to get the steel male fittings instead of the brass male fittings. So far they pass leak checks with flying colors.
Doesn't matter what nipple you standardize with on all your tools as long as all your hoses have one of these on them. I bought one to try out and I absolutely love it.
https://www.amazon.com/gp/product/B00CD8FHQY/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
5-in-1 Safety Exhaust Coupler - YouTube
I use Lincoln style on all my stuff since that what dad swears by in his body shop. The longer nipple seams to make the seals last longer.
Might have to look into those. I cant stand when a fitting is leaking air