I run the standard over the belt loops on my Alien Gear and even with a tucked in shirt they are easy to miss. I wear a black ccw belt and black clips. To me the velcro clips would be more hassle than they are worth, but I see their value for someone who must have complete concealmemt. For me personally I like the over the belt clips because they are easy to put on and take off.
Most of the time I carry at the 3:00 position in kydex holsters both IWB and OWB with a cover garment over my belt. The rare occasions I carry with a shirt tucked in over my gun I carry in my Alien Gear about 4:30.