I've been carrying concealed since 1996 and my present EDC (everyday carry) consists of a Glock 19, primary weapon, using an IWB made by Tagua (extremely comfortable) along with a Ruger LCP, secondary weapon, in a front pocket holster made by Desantis. In addition, I carry 3 spare Glock 19 mags, and 2 spare Ruger LCP mags. I'm 6' in average, large frame, and wear loose fitting clothing with slightly over-sized shirts, preferably not tucked, to compensate and enhance concealment.
For those new to the CCW world, it may sound overboard to carry 2 pistols, but to others it sounds ideal and sensible. Why a secondary pistol? Choice, peace of mind, and works for me ergonomically.
Someone previously posted you will go through holsters and possibly pistols to find the right combination that works with your body frame size and style of clothing you generally wear everyday. My advice is to rent the pistols or revolvers at a local range and see what realistically works for you in safely handling, controlling, and understanding the mechanics of the potential firearm(s) you wish to purchase.