Hanger 18 is epic but nothing else on RiP really stood out for me, so I gotta go with MoP. Plus I've always preferred James' voice over Dave's. Megadeth's latest, End Game, might be their best IMO.
"Whatever dramas are going on in my life, I always find that place inside my head where I see myself as the cleanest, tallest, strongest, wisest person that I can be." -Layne Staley
"The earth we abuse and the living things we kill will, in the end, take their revenge; for in exploiting their presence we are diminishing our future." -Marya Mannes
"Those who believe absurdities will commit atrocities." -Voltaire