The truth is that he's not wrong.Tell me you don't shoot without saying it.
1/10 Mil subtends 0.36 inches at 100 yards, whereas 1/4 MOA is 0.2618 inches at 100 yards. The 1/4 MOA per click adjustment is more precise than 1/10 Mil.
I'm not making a judgement on one vs. the other, just that a 1/4 MOA per click scope has finer adjustments than a 1/10 Mil scope.