For me it MIL's for the simple fact that as @ANTSMAN pointed out they are 10 based like our metric system and that's easier on my brain. But as long as the reticle and turret are the same it does really matter. I reckon they need to match for 2 reasons.
(1) When I Zero my rifle I fire a 3 shot group, go up to the target and put a bright orange sticker right in the center of that group then go back to rifle and measure from point of aim to point of impact (sticker) using the scope, then adjust as required. Shoot another group to confirm and usually job done. I have lost count as to how many people I see chasing there tails trying to sight in using a ruler and trying to work out how many clicks to adjust (Especially with MOA scope's and our metric range)
(2) When shooting at distance if you can spot your shots and have a miss you can measure this with scope and adjust aim accordingly. Easier with no math if MIL/MIL or MOA/MOA.
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