There are so many ways to carry your firearm concealed and there are a lot of different styles of holsters. The Inside Waistband is a very good method. I don't always get to utilize it, but when I do, I use the new holsters from The Southern Trapper just like the ones Greg provided photos for here.
Note the metal clip on the Mustang holster versus the Alligator strap and snap on the 1903 holster. You won't go wrong with either option. The clip goes on and off faster, but the strap seems to add an extra measure of security.
All three guns for which Greg has IWB holsters are smaller caliber guns, two .380s and that old 1903 is .32 ACP. The smaller frame pistols work better for me than larger, heavier guns when it comes to tucking them in this manner.
The best holster is the one you are most comfortable with and will use. There is a lot of variety in selections to choose from and while I use different guns and different holsters all of the time, I have to say that the IWB is the most concealable.