Late to this party.
Glock 19 is a good choice. Reliable. Factory sites suck, so replace them. The trigger sucks, but the Gen 5 trigger sucks less. The MOS plates suck, get a CHPWS plate instead. It’s a bit thick.
Glock 45: completely pointless. The hard thing to conceal is the grip and this has a longer grip. A 19 is a better choice.
Glock 43x. A lot easier to conceal than the 19, but also less comfortable to shoot. Unless you are already a Glock guy, go with the P365xl.
Glock 48: I don’t see the reasoning behind this. It doesn’t do anything a 43x won’t do.