I have and EDC the P250SC in 9mm. Great pistol. When I first purchased it I was uncomfortable with the long trigger pull, but the more I used it, the more comfortable I became with it.
There's no safety, it's a revolver - pull the trigger, it goes bang. The trigger pull is long, but unbelievably smooth. In fact, the long pull is one of it's safeties. The orig magazine holds 12 rounds with one in the chamber for a total of 13. I purchased the extension mag, which holds 15 plus one in the chamber for a total of 16.
It is very accurate, it's not a range gun, it's a self defense gun. That being said, at 25 yards, slow fire, I can put them all into a 5" bull. Rapid fire? Look at some YouTube videos. It's not a problem, and double taps are very easy and quick. The extended mag also tends to keep the muzzle flip down even more than he SC mag, making it quicker and easier to stay on target.
Sure, the XDs is smaller, maybe .1 inches narrower, but the bad guy doesn't care how small the gun was. If you would have asked me several months ago, before I carried and shot the 250, I would have said I wasn't sure yet. Now? I love it.
I also carry a Smith 642 or a Ruger LCP depending on my clothing or where I'm going, but probably 80% of the time it's the 250 carried IWB. I'm an older fart, 5' 11" and 220 lbs. not a tiny guy, and the 250 carries and conceals perfectly in my N82 holster.
Try them both if you can, whichever you choose, spend a lot of time training with and shooting with it and you'll be just fine.
Good luck and stay well....