I would say the MKIII if you want a pistol more forgiving of what you feed it
My question is, why would you pay this much for a pistol and then want to run the cheapest ammo through it?
The M41 has one great advantage over the Ruger, two actually, the first being if it breaks...YOU can buy the parts and fix it.
It is a very conventional design.
The second is that the receiver and grip frame on the Ruger are two pieces.
Everytime you remove that receiver you increase the tolerances between it and the grip frame.
This problem is easily solved by installing the Majestic Arms Speed Strip Kit, but only me and a few other hard core crazies do this.
(All my MkII's have this conversion.)
Both are great guns...
....but if I had to choose, I think I'd go with the M41 because it is just so easy to work on.