So, I main SMN, and have been since 2.0 and today, I was told for the very first time by a SCH in Expert today that I shouldn't use II at all, and only use I. He left before I could ask him his reasoning, but I have a feeling it's because Ruin I uses less MP. It does, and the potency is the same, but it doesn't use THAT much less MP, and Ruin II blinds, and allows me to the freedom to move and DPS as well. If an AOE drops on me, I can Ruin II and move at the same time. I can Ruin II while I move in to Miasma II and Ruin II again to move back at a safe distance. And I have never once been in an instance where I run out of MP as a result of constantly using Ruin II. Maybe the SCH is just really bad at MP management? I dunno...

Fellow SMNs, any of you use I over II?