There's more to an IWB than a choice between clips and snaps.
I have some of each, and clips are no easier to attach than snaps, and not as secure. If you need to tuck, then clips are the only choice. However tucked holsters are really hard to put in play in an emergency. There's no springiness in clips, so they tend to rotate and eventually loosen the attaching screw. (An exception is the Sparks VM2, which uses two screws for snaps, or optional clips.)
One clip, two clips, wings or not? I strongly recomment two clips (or snaps) on wings with a revolver. Revolvers are pretty snug once a belt is tightened over the whole lot. Two snaps are stronger, and when widely placed on wings, less likely to twist and bind when you draw. They also take less belt tension to keep them in place, because the wide back spreads the weight on your hip. These holsters are by necessity a two-piece design - front and back.
A folded design, like a Sparks Summer Special II (and many others like it) have one or two clips/snaps in the center of the holster. They work best with pistols, especially long pistols like a 5" 1911, because they can move around a bit to fit your anatomy and position. They don't twist in a draw because of the geometry of pistols is more straight-line. They bulge a bit more than winged designs, but not enough to matter in concealment.
I have Sparks VMII holsters for a 3" L frame and 3" N frame. I couldn't be happer with the fit and comfort. I use snaps, but loosen the leather by bending it backwards below the snap. That makes it much easier to snap around a belt, especially a thick one like a 1-1/2" Beltman. With practice, it takes no more time than putting on a good paddle holster (e.g., Kramer).
If possible, I prefer to carry revolvers in an OWB holster with a pancake design. Less belt tension on the cylinder (and waistline) and much more comfortable for all-day carry. All you need is a longer cover garment to keep from showing. I just received one for a 4" K frame (66-1), with snaps rather than loops, from Ryan Grizzle. It is the nicest holster in fit and finish that I've ever purchased.
Well I got my holster in today from Ray. I ended up ordering for a 3" 66-2 and could still use it on my 65-3 also. It took a little over a month from my first email until it was on my doorstep. I ordered 3" 66-2 neutral cant horsehide holster. I love it, can't wait to go out tomorrow and carry it a little.
