I would say that would depend more on your engine than the oil. I have it on high regard from a respected source here, (who will remain unnamed) that another premier oil maker, has stated that M1 0w40 is some really impressive stuff.Would you say M1 has less wear protection or just that it's unknown?
I am sure you will hear many sides to this story. But either would be a good choice.
Either way, I am sure you will be well protected. I would no add any zinc booster to either one.
IMO, from my limited means of research and understanding of motor oils, a difference of 400 PPM of anti wear additives such as phosphorus, would be enough to indicate, on paper, the "wear protection package" would be "higher". Which is to say if oil A has 900 ppm, and oil B has 800 ppm, theere really wont be a difference.
VR1 has at least 400 ppm more than M1. But their is much more to the story than just ZDDP, these days.
If you are into doing oil analysis, do three changes with each, maybe at 3000 mile intervals and post them here, I am sure many would love to see it, I would at least.
Thats really all I got.