I have both and shooting them side by side I vastly prefer the XL. As I mentioned in another thread, I think that Sig's decision to use a full-length RSA on the longer slide was a great one. I can really feel a difference in recoil pulse. The XL is much more forgiving and does not try to twist in my hand under recoil. Both guns are extremely accurate.
I recommend you get your hands on one and try it. Your results may be different, but I am very impressed with the P365XL.
Anyone want the flag trigger from mine ?
Think I want the curved on the XL