Both are good pistols. The 9c is a bit more concealable than the 19 because it is a little smaller, but others may have different opinions based on their experience and lifestyle. Glock set standards when the introduced the 19. It's size, along with its 15 round magazine capacity, reliability, and accuracy made it a great all-round pistol. The 9c is more of a slight step up from a G26 in size and capacity. I would consider it a great concealed carry pistol if one is looking for capacity without a great deal of bulk. I have carried 19/23s for a number of years, and because of my build and manner of dress, prefer the 9c to the 19/23 when I need to conceal a handgun. I have medium sized hands, so the lack of pinky support doesn't necessarily bother me when carrying the 9c with the flat base plate (I learned with G26/27 that the gap between the edge of the grip and the extended base plate pinched my pinky during cycling/recoil). I like the 9c's factory finger rest base plate, but ace no problem when using a 17 round magazine in the gun without an adapter. Unlike Glocks, the 9c doesn't seem prone to shooter-induced feeding problems caused when "torquing" on the extending full size magazine protruding from the grip.
I am not a proponent or the one-pistol-fits-all train of thought. For years, Glock pistols probably came closer than any to fitting a wider range of shooters, but for those with really small hands, the M&P is the clear winner between the two. In terms of ergonomics. I prefer the M&P, but again, it's a matter of personal preference. With factory night sights, the M&P's are better than the ones Glock calls their own, but again, it is a matter of preference. My two M&P 9s, as well as my 26 currently wear Trijicon HDs. Glock magazines are generally going to cost you less than M&Ps. There are still more holster options for the Glock based on its popularity, but if you shop for gun leather on-line, that should not be a problem.
If you're looking for a concealed carry pistol in a non law enforcement setting, a G43 or a Shield would be a better choice as they're much easier to keep concealed. For an all-round pistol for carry, home defense, and even weekend competition, a G19 would fit the bill nicely. Nevertheless, the 9c is a nice pistol and has its own virtues. For what it's worth, the prices you quoted were pretty decent.
