Apples and oranges, they are close enough not to really make a difference when carrying. That said the truth is in pudding and one should likely carry the one that performs best for them on the range, so let that test target decide for you.
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Perfect answer. I started with the Standard before the XL came out and flirted with getting an XL for a couple years and recently finally got one on a Tac-Pac deal. Now I’m mainly carrying the XL, but have two complete guns and have the option to swap slides and frames to any configuration with extra magazines for not much more than just a slide, barrel & RSA would’ve cost.I own both and I personally don't think the difference in the length of the slide or barrel makes a huge difference. Neither does the length of the grip unless you have small hands that are out of the way of the magazine with the XL grip.
The standard model, iron sights, and a 10 round flush magazine is the king of the platform for me and works as my pocket pistol. I shoot both about the same. I practice with the XL because the dot tells all but other than that and the trigger reach it's like shooting the same gun. The standard model fulfilled a need. My XL was a thing of curiosity and it's in a weird spot. Even with the optic though I will admit the XL slide works surprisingly well in my pocket holsters if I put the short grip on it.
The standard slide still does it a bit better.
IMO instead of an expensive aftermarket slide.. pick up a new in box XL off the shelf and the magazines that come with it. Now you've got all kinds of options with more bang for your buck. That's why I bought my XL anyway. It was more cost efficient than ordering an XL slide and barrel.