M2.
4MOA is small enough!!!!!
The battery life of the M3 is what I covet!
Possibly I need more time with the M3, as I have the capacity to become a stick in the Mud when it comes to all things new.
As long as the thing keeps being reliable, either should do just fine.
It's a shame when optics push the manufacturers of batterys, and not the other way around.
Keep safe!
E4E