Hi, I got all three the G19, the SA XD9 and the P99 in 9mm.
My XD has been perfect for 1000 rnds, has a very good trigger, the grip angle is very good for natural pointing but it is quite top heavy and considerably wider so IWB CCW takes more room in the belt. Over all pistol seems to be a verygood shooter and reliable. And with cheap mags it's a good buy.
My G19 is unusal in that it's jammed alot. No I'm not limp wristing it, and I've got 3 other Glocks for about 5yrs now so it ain't me. Anyways it's a great IWB CCW pistol cause f it's slimness and size. And has a very acceptable trigger for striker fired action. FML mags are very expensive. Biiggest complaint is the finger ridges don't fit me with a crap, and It dos'n't point well for me.
The Walther P99 9mm. Has a great grip size for me, and has three backstraps to help it fit all hand sizes. It has the XD grip angle and points great. The trigger is DA/SA and any Glock trigger man can shoot this pistol great. SA trigger reset is Glock quick or quicker. DA pull is long and heavy as it's intended to be, like ALL DA/SA triggers. And the triggers smooth out very nice with dry fire trigger work. The decocker works like any decocker, it makes the SA trigger to a DA tigger pull. It comes with4 front sightes to tune the pistol to your load and rear sights are windage adj. They seem well made and fairly rugged.
Of the three I shoot the P99 the best, accuracy is very very good. It came with a test target with 5 rnds in 3" @25 meters. I've shot 8 of 10 shots in about 4" offhand @25yds with Speer gold dots. Good enough for me.
Also metal full cap factory mags can be had right now for 70-85bucks. The Grip is not as long as the XD but about 1"2" longer than the G19, But it has a rounded lower backstrap, like the Bobtail commander set up and the bottom rear sides are slightly rounded also. So the grip while longer than the G19 dosn't seem to print as much with a Tshirt carried at 4oclock.
And the top of the slide is angled off, rather than the flat top slides of the G19 or XD. I believe it is lighter than the G19 and thinner also with the same overall length. the G19 and the P99 does not feel top heavy to me at all. And the P99 has the low bore axis, almost as low as the G19. Or atleast it feels that way as muzzle flip is as mild as the G19 and gets back on target as fast.
The XDs top heavy makes for slightly more muzzle flip and not as fast back on target.
Mine as been flawless for about900 rnds now.
So I highly reccomend the P99 for IWB CCW use. It is a very high quality pistol and designed by former Glock engeneers, so I can't see any reason for this pistol to have anything but a long service life with tons of shooting.
And Walther has hooked up with S&W for service and they seem to have a good service dept.
Also Walther has had a price cut of about $100, so it is priced right in the Glock neighborhood. I gave $519 for mine last month.
Arround here the XD goes for $400-495. And G19s for $500-560.