I prefer the trigger on the SR9c, which contributed to my choice to buy one. The M&P9c is slightly more compact, and has arguably better ergonomics (which is saying a lot-- I love how the SR9c fits even my big hands). The SR9c's trigger is smoother, and the break is affirmative, without being too stiff. After 700 rounds or so, it was even more smooth. At 1,100+, it is truly great.
In my opinion, these two pistols are among the best options for concealed carry. Add in the XDm 3.8", and the Glock 26, and you have a group that are easily concealed, without sacrificing performance.
Currently Own: Beretta PX4 9mm, Glock 23 (Gen 4), Glock 19 (Gen 4) x2