I am transitioning to using John Guest fittings (push-to-connect) for both beerline and gas line. US Plastics has a 1/4'' flare to 3/8" OD tubing connector, so I use that on my QD's, and I can just push the collar to change the fitting, rather than using a wrench.
I am also working to transition my manifolds to use the same type of fitting so that eventually all my connections will use the John Guest fitting to make changing things and moving things around easier and I don't have to worry about clamps (except for check valves on the gas line).
Walk-In Serving(14): Oatmeal Stout, Hard Cider, Belgian Tripel, Liquid Stupid, Belgian Dark Strong, Red Bull, Rye IPA, Double IPA, Imperial Stout, Irish Red, Scottish 70/-, Belgian Wit, Nut Brown, Traditional Mead
Walk-In Cold Storage(~50): Cysers, Braggot, Melomels, Ciders, Traditional Meads, Persimmon wines, Dry Stout, barleywine, cream ale, sodas, Chocolate stout, milk stout, and others I can't recall.
Fermenters (0): Nothing current.