I have JR and Ruger PCC (both in 9mm)
The Ruger is heavier and definitely better built. That’s not to say the JR isnt well built, just that the Ruger is almost over built.
If I’m heading to range with limited time I’ll always pick the JR over the Ruger because it’s more fun to shoot. If it was the end of the world and I just had room to pack one I’d take the Ruger because it will last forever.
I run Pmag’s in both with no issues at all.
I've heard from several people at my local range the Ruger PCC does not like to hold zero when you take it down.....not sure if this is still happening?
Granted this was years ago when they first arrived in Canada