Lasers are useful, but most of them mount of rails and so require different holsters from the plain pistols. This M&P Shield with Lasermax CenterFire is a handy sidearm, but none of my old holsters would accommodate it.
Enter three options from DeSantis Leather:
1. Belt holster. The knife, by the way, is a chain drive design from Rat Worx.
2. Soft tuckable IWB that works for shield and similarly sized designs.
This one has the useful added feature of adjustable cant.
And 3. Superfly, a sticky pocket holster with a removable shape shield.
With the shield, it offers the greatest concealment, without a slimmer form.
For the compact pistol like Shield, I would think Superfly to be the best choice. If IWB or belt carry is used, might a well carry an M&P Compact or full size. Your call though.