I no longer own any Glocks (gasp!), but used to own a G19 and a G48 (longer slide version of G43X but same frame).
For me, I shot them about the same. The 48 carried LIGHTYEARS better than the 19 for me. I could still carry a G19 just fine, but man those slim Glocks are amazing! Felt recoil was a tiny bit more just due to reduced weight, but I still shot my 48 fine (even used it for a USPSA match, with factory 10rnd mags, when the front sight on my 92G came off mid-stage).
Part of why I let it go, aside from my wrists not liking the grip angle as much as I got older, is that I didn’t view any of the 15rnd mag options as being reliable enough for carry. Everyone has to form their own opinion on that, and I didn’t necessarily feel undergunned with the factory 10rnd mags (the grip angle was the major factor in me parting with my Glocks). But that still played a role in my decision.
Great guns though, IMO. You can’t go wrong with either a 43X or a 48!