MOA Vs MRad
Mildot's are the same as MRAD. The trick with either system is to have your reticule graduated the same as your turrets.
For some reason, and I think its because your average American dreads the metric system, MOA turrets have remained pretty much standard, but the American Military moved over to metric hence Mildot type reticules and maps in Km (or Klicks)ect.
I suppose most civvie shooters understand MOA as a 1 click adjustment moving the POI 1/4" at 100yards (give or take a a very small fraction) where as 1 click moving the POI 1cm at 100m is a bit "alien".
The math working with Mil's is much easier as its base10, where as with MOA your stuck doing distance calculations in imperial units, and turrets where 1 click generally equals 1/4 MOA (or sometimes 1/2 or 1/8MOA)
The real problem is having Mildot reticule with MOA turrets as you then have a another set of conversions to do, and unfortunately today, with the majority of scope makers, that is in fact where we are when it comes to tactical style scopes.
The problem for folks who wish to remain using MOA is that very few company's produce scopes with MOA graduated reticules; US Optics is one, and possibly Nightforce is another.
The good news is that more and more company's are offering scopes with Mil based reticules and Mil based turrets.
The beauty of keeping the units the same in both the turret and reticule comes when making shot corrections.
Lets say you guesstimate a steel plate is 750 meters away (you could use yards, it doesn't matter) and you dial the appropriate drop in your scope and take a shot. Observing through the scope you see it strikes low.
Now think of how you would correct for that shot presently. With most methods, there's a bit of head scatching as you work how much to come up at that guestimated distance, and how many clicks you need to achieve that.
If your reticule and turrets are both in graduated in the same units ie Mils, the exact distance to the plate would be irrelevent as would the linear measurement of the low shot, as you would simply measure how far the shot was low using the graduations on your reticule, (lets say 1.5 Mils) and then dial up 1.5 Mils on your turrent. You could either count those 15 clicks, or use the scale on the scope turret and turn it to 1.5.
In theory, it would work exactly the same if your scope had a MOA reticule and MOA turrets, although because 1 click is generally = 1/4 MOA, the dialing and counting is not so "neat" as the base10 Milrad system.
Windage corrections can be done in the same manner, although the changeable nature of the wind adds a big variable what ever correction system you use...