Let me throw a monkey into the wrench:
First off, let me clearly indicate a couple of things which definitely affect why I say what I do: I carry a gun with me at all times. In a former life, I put bad people into prison for a very long time. Most of them still don't like me. I've carried a handgun as a cop, a soldier, a contractor and as a civilian. I've had to use my handgun under very trying situations. I have experience with the Glocks (17's, 19's, 22's, 23's, 26's and 27's), but I don't carry one, for reasons I explain below. I have experience with Ruger's, but have never carried one of their automatics for duty or non-duty use.
To quote Clint Smith of Thunder Ranch: A handgun is supposed to be COMFORTING, not COMFORTABLE. The very minor difference in size between a G19 and Ruger SR9c is something to which you can adapt.
Go for reliability. Glocks have, literally , MILLIONS of rounds through them. They're eminently durable and reliable. Magazines are easy to find and, until Obama tries to pass the next gun legislation, rather inexpensive. Aftermarket options are abound from night-sights to extended magazine/slide releases are easy to find.
The Ruger? Not so much so.
The grip angle? Well, I'm one of those who don't like the Glock's 33-degree angle. Why? Because I'm used to the lesser 17-degree angle like you find in the Ruger and most other handguns. Is this a problem? Not in the real world. I'm just stubborn. I've trained hundreds of people for their first time transitioning to a Glock from the other grip angles. Know what? They adapt rather quickly. It's all in the practice. We're adaptable animals. We learn. Practice drawing and aiming the pistol each night (unloaded, of course, and at something safe), say 25 times, and before long you'll be pointing the gun where you want it to go.
Concealment: A good holster is always important, as is placement of said holster. Again, it may not seem convenient to pull the holster back a bit so that the handle curves into your side rather than sticks out. . .but learn to deal with it. Put it in the same place every time when you practice and carry and you'll learn. Eventually, it'll become second nature. Additionally, assuming you have a concealed carry license, don't worry too much about printing unless it's stupidly obvious. Most people are oblivious to others around them. Just learn not to "press check" (i.e., keep touching the pistol) to make sure it's in place (it always is), and you won't draw attention to yourself.
For those griping about the "lack of safety" issue. . .first off, your real safety should be between your ears. Second, it's exactly like a revolver. A revolver doesn't have a separate mechanical safety. As you practice your drawing and aiming, practice extending your trigger finger alongside the frame above the trigger. Do this regardless of which handgun you choose.
The G19 has a lot more going for it than the Ruger. It's small, higher capacity, easier to get parts for, extremely reliable, easily configurable to your preferences with aftermarket products, accurate and easy to use. Personally, the only arguable issue is price, but I'm willing to spend $100 more for a gun that I know will work and that I have confidence in.
Just my opinions, worth exactly what you paid for them.
<edited for a spelling error>