Mrad is metric and Moa is imperial
BULLs**t.
MRAD is based off of the 1:1000 ratio meaning 1 mil (10 clicks) at 1000 yards is 1 yard, or at 1000 meters it's 1 meter, or at 1000 inches it's 1 inch, or at 1000 miles it's 1 mile. There is no metric or imperial BS to angles in general. Just because an MoA is roughly 1" at 100 yards doesn't make it imperial. At 934 meters,
one click with an MRAD scope is 0.0934 meters or 9.34cm. At 934 yards, one click is 0.0934 yards or 0.0934*36 inches. It's obvious that using meters for ranging makes it easier for math which is why MRAD gets confused as metric sometimes.
There is no real reason why I pick MRAD units for my optics, but I do. I like the idea of the 1:1000 ratio and it's what the military uses which, again, means nothing really.
The major con against MRAD is that the 1/10 MRAD adjustments are coarser than the 1/4 MoA adjustments, meaning 1/4 MoA at 100 yards is about 0.25" where 1/10th of an MRAD is about 0.36". If you are worried about 10cm click values at 1km ranges, than go MoA, or better yet 1/8 MoA adjustments. However, because you've picked FFP (bravo on that), I doubt that'll be an issue (reticle thickness becomes more of an issue at long ranges).
Your main concern is the purpose, budget, and most importantly,
matching the reticle hashmarks to the turrets (why there are so many mil dot scopes with MoA adjustments is beyond me). If you are shooting pop cans from 3km away, get SFP and 1/8th MoA adjustments. If you are hunting (even at long ranges) or don't expect to get 1/2 MoA precision out of your rifle, going FFP and MRAD is nothing to be afraid of.
Also,
MRAD clicks are way too coarse
Sorry Jerry but I wouldn't go so far as to call them
way too coarse. At 1000 yards, one click (1/10th of a mil) is 10cm or 3.93" whereas 1/4 MoA at 1000 yards is about 2.63". That means the MRAD scope is about 1.3" more coarse (actually more like 1.3" divided between 2 clicks so 0.65"). Now, if you're getting 1/2 MoA precision at 1000 yards, that's still about a 5" grouping, more likely to be a sideways elipse too. Centering that group on the vbull to +/- 2.54"/2 with the MoA scope or +/- 3.93"/2 with the MRAD scope seems like peanuts imo.
Basically, the MoA scope will allow you to get
up to 0.65" closer to your target at 1000 yards.
And to the OP, read this:
http://www.mil-dot.com/media/1027/the_derivation_of_the_range_estimation_equations.pdf