I have two I like.
Garrettindustries for my 1911. Very comfortable right out of the box and nicely finished. This is now my edc rig. Link Removed
And http://theisholsters.com/ for my 9mm. Well made and comfortable after break in.
Alien Gear makes a good one. And if you get a new gun you can trade in your shell( for free) or buy a new shell and keep the one you have. My nephew bought the iwb holster with 3 different shells.
Those actually look pretty good! May have to try one out for my shield. I've had Crossbreeds in the past and currently using a Milt Sparks VM2. But for the hybrids I stopped buying Crossbreeds since there no better than the ripoffs that cost literally half. But I must says N82 tactical's are INSANELY comfortable, but no combat cut.
There is no best-only what is best for you. Strangely, I find the lowly Uncle Mike's iwb to work best for me. I carry a full size gen 3 smith autoloader or a j frame in them with no issues.
If I carry all day, Crossbreed Supertuck is my go to. Very comfortable and stays put. If I put on and off multiple time in day (like when I get to work, church, etc), I use a Don Hume 715. Great holster for slipping inside the waste band quickly or just for storage in the glove box.
Naturally everybody thinks the one the use is the best, and I'm no exception. Been using a Pro-Carry Deep Comfort IWB, from The Holster Store, for years.