I 'grew up' with the mil system in the Army. Bino reticles and scopes were all marked in mils so any spotter would give correction in the same language. My use was on tanks so ranges were a bit different :) If you use a spotter on a regular basis then use whatever reticle they use for targeting information. And do get adjust knobs the same as your reticle.
On rifles I like MOA mainly because most of my targets are marked in inches and sometimes MOA. NRA targets as an example. A side benefit is the MOA marked scopes are sometimes less expensive.
Other than convenience there really is not an accuracy advantage.
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