Single vs Dual Clips?

I've been using a "cover six single point swivel" holsterhttp://coversixgear.com/holsters/single-point-swivel/for my CCW (Springfield xds 9mm 3.3). I'm looking to buy a Glock 19 and use it as my EDC instead and either sell the XDS or keep it for when I'm in shorts/t-shirt since it'll be easier to conceal.My question is if there's a reason that most high quality tuck-able IWB holsters have two clips on your belt instead of one? I've like the ability to swivel the XDS since it makes different situations (driving, sitting, doing yard work, standing) more comfortable if I can move the degree the firearm sits at. The retention isn't great, if I turn the holster upside down the firearm will fall out but I haven't had this happen and have been EDCing for ~3 months.I definitely need it to be tuck-able since I'm in business casual most days for work. Are there better options out there than what I've been using that will have the same features? via /r/CCW http://ift.tt/2afS4p9