cpc make the best QC's but they are plastic (HFC12 NSF Series) and very big.
Zalman also make some plastic ones - but they are restrictive and designed for 3/8 or 10mm ID pipe.
Phobya make two types - one is very poor (and hard to find now).
The other is a copy of the first generation Koolance ones (ocuk value range).
The current 'no drip' koolance QC's are third generation (recently revised due to a defect in the seal after multipule uses)
A high flow quick disconnect is complex and heavily machined, so expect to pay a lot.
I own the VL4's (importing them for the US was about 30% cheaper then getting them here)
The only downside with Koolance stuff - is all there compression fitting (inc QC's) use steel for the outer nut, so it may rust if you don't keep them dry.
Mine show no sign of rust after 3 years of use - but it's worth knowing
But using a two low cost ball valves does the job just as well.
Or use a male barb and female compression 1/2 QC's
