A Shield Plus may fill a nice sweet spot between the P365 and the 43X. Not as easy to conceal as a P365, but a shorter grip for a given capacity than a G43X/G48.
I have a P365XL and a Shield Plus, and used to own a Shield 1.0. I, and others who have shot the Shield pistols back-to-back with the P365XL, thought that the Shield has a flatter recoil impulse. I haven't shot 4.0" examples of the Shield/Shield Plus, so I can't comment on those.
I have shot early examples of the G43X and G48, but it's been too long for me to remember how they shot besides one had a notably worse trigger (Monday morning/Friday afternoon gun, perhaps).
When it comes to AIWB carrying, I do find that my 3.1" Shield Plus has more of a 'keel' effect with the 13-15 round mags than the 3.7" P365XL. This can be mitigated by using a 4.0" model holster or attaching a wedge.