I just want to say, Omnirod is SO UGLY!! Even worse than the scholar book >.<
Apart from that, I still prefer Thyrus Zenith. Although SS is useless, I value Det more than Crit, and I haven't had (much) mana issue for all the end games except turn 5. I only get to the fireball phase and already seeing myself losing mana like hell, but I doubt the extra Piety from Omnirod will help much.