Kydex will provide the easiet draw. CTAC is all kydex, MTAC is only half kydex. As far as being discreet, both the MTAC and CTAC hide even fullsize pistols well. The MTAC is generally considered more comfortable than the CTAC, but you can make the CTAC more comfortable like I did.
+1 on the kydex suggestions. Kydex is going to be thinner which is important on a double stack handgun such as the M&P. Kydex is also going to give you a faster draw. For concealed carry, a kydex IWB is an excellent option. Try http://www.bearclawholsters.com and http://www.hillsmanholster - very nice stuff. Pesonally, my money is BearClaw and I've purchased a 'Hidden Asset' for each of my carry pieces.
While Kydex is thin, fast, and weather-proof - leather is luxurious, attractive, and does it's job well. Consider http://www.kdholsters.com and the numerous other custom makers.
There is no such thing as 'best' unless you are talking about Matt DelFatti's holsters :wink: Everything else can be grouped as "very good" or "sux". LOL. Just avoid the store-bought stuff and you'll end up very happy with your choice.
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