I have both.

I'm not a Glock fan at all, but the G42 might be the last Glock I sell. It's kind of the perfect 380 IMO. That said, it lives in the safe.

While the G42 is flatter, I think the actual difference between the two will be minimal, and you sacrifice the ultimate reliability of a revolver.

If I carry a 380, it's my Bodyguard which is significantly smaller than both a G42 and a J frame. But 99% of the time I carry a J frame or my Taurus 445.