I had to install a flush trigger safety on my 43x. I hated it before that.The G43x stock just plain sucks to shoot. VERY snappy, even with the full length grip. The trigger slap was HORRENDOUS!!!! Bought a Griffin Armament threaded barrel and Micro Comp in hopes that the Micro Comp would tame it some. It Works great and its now a pleasure to shoot. Cost $185 to make it shootable though. Lost a little bit of accuracy going from polygonal rifling to standard rifling though.
The G48 is great as is, though not a fan of the standard mags. The only mod I did to it was install a Vickers Tactical Ghost extended slide release, and a Hyve extended mag release. I have Shield Arms mags for both the 43x and 48
The shield Plus isnt great out of the box. Its a pleasure to shoot out of the box but I have a few issues with it. The trigger feels like total junk during take up but has a very clean break. Also the pivot pin for the trigger safety is also a bit low so you have to place your finger lower on the trigger than one normally would or the trigger safety wont activate. Its just something I have to train for.
The grip on the Shield Plus sucks. Im ready to quit shooting it after the 1st box of ammo. I currently have a bike innertube sleeve over the grip which isnt Ideal. Tried other grip sleeves and they make the grip too fat and squishy for me. Im thinking that in the end, I will end up sanding the grip down to a comfortable level
Shield Plus isnt as accurate as the 43x or 48 ( I have the 4in Performance Center Shield Plus ) but again, I think thats do to the polygonal rifling of the Glock barrels
In the end, the 48 is my preference. My daughter and brother both have the Shield Plus so I will occasionally (Family outings ) carry the Shield Plus