Well, you're an American. No, really... that's the issue. We find MOA very intuitive. We don't think in metric. That said, as I've gotten into longer range shooting I've found that MRAD is kind of preferred because the math is a little simpler. ANd flexible because 1 MRAD is 1 meter at 1000 meters, 1 yard at 1000 yards, or 1 mile at 1000 miles. It's a radian angular measure. But we came of age in the states where we try our darndest for "sub-MOA" groups. We even define a rifle by MOA.
I have Bushnell scopes on my .338 and 6.5 Creedmoor which are my 2 long range guns. Both are very expensive (DMR ii Pro and LRTS) but at their top line it's all MRAD. Different companies vary on this but I suspect you'll find that high end scopes made for long range shooting skew MRAD.
I think you'll do yourself a service getting into MRAD because of international push. I'm sure you've noticed that .223 and .308 don't get NATO designation. Our military is already shifting metric and while I prefer the Imperial System for day to day use metric really shines in quick conversions.
Good luck!