Either one just measures the angle. It is purely a matter of personal preference, but I like my clicks to be .25 moa, as opposed to .36. Mainly I like the fact that 1 moa is real close to 1" at 100 yard, 2" at 200 yards, etc. 3.6 doesn't multiply (x2, x3, etc.) so easily..\
Great to 500 yards but after that starts to fall apart. @ 1000 yards 10 1/2 ". I shoot both but am slowly working toward all my long range guns Mils.