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): Flanders red, Hard Cider, Belgian Tripel, Liquid Stupid, Wee Heavy, American Brown, Rye IPA, American Amber, Imperial Stout, Dry Stout, Cream Ale, Belgian Wit, Traditional Mead, Oatmeal Stout
Walk-In Cold Storage(~50): lots of beers, meads, and ciders
Oak Barrel: Flanders Solera