Both reticles would work just fine as far as i can see. ART has 1.5 MOA stadia, and TMR is .5 mil or 1.7 MOA. The ART would probably be quicker to reference with the stadia being labeled. That's handy.
Personally i like direct windage reference in my reticles which is why i like the rapid reticle so much. Also the stadia numbers are past the "10" mph windage stadia so they won't interfere with wind dope--- BUT i don't know if they'd put it in a Leupold-- be interesting to see if they would tho-- www.rapidreticle.com