I've owned a number of Taurus revolvers, including my favorite .44 Special snubby - a gun that S&W didn't make, except on an oversized L frame. None of them were ported. I don't like porting either.
S&W says that it's safe to dry fire they're revolvers. But if you push the issue and ask, "Does that mean that the firing pin won't break, not ever?" You'll get an answer along the lines of, "No, but if it does break we'll fix it."
This would be fine, unless the revolver was kept, used or carried as a weapon. When that is the case the whole issue becomes much more important - at least to me.
Using snap-caps in either make of gun will substantually reduce the chance of having a spring get mashed, or a pin broken. I consider my neck to be worth much more then the cost of a set of snap-caps, but I'm not sure that the folks at S&W (or for that matter, Taurus) feel that way.
Sometimes common sense is a lot better then what's printed in the user's manual.
Incidentally, new Colt Single Action Army revolvers come with a manual that says, "DO NOT SHOOT THIS REVOLVER!" and goes on to explain that the gun is met to be a collectors item, and shooting it will reduce the value.
I know some folks that don't pay attention to that either.