Personally for me it comes down to reliability, my ability to shoot them well and logistics. If the G48 will do that for you I see no reason to get another platform unless you're just wanting something different. Recoil and ability to shoot the gun is going to vary some from person to person as previously stated and I think you need to shoot both a little and see what you like about the two of them. I want to mention attachments really quickly if you need or want a light on the front the Sig's seem to have a better track record. While I have never had an issue with the G48's or Sigs there are folks on here like @
HCM and others who are better in the know or have first hand knowledge on attaching lights and lasers to the slim line Glocks and their potential for problematic function.