Forum:Confused about tech pools

I have a pestilent crux about 130x7 damage and a vitriolic crux about 150x7 damage. The pestilent crux has a very high elemental chance and the vitriolic crux I think has a high elemental chance. I'm pretty sure both are X4. I have an understanding of what tech pools are but not about how that affects damage. Which gun is better given that all other stats are about the same? Thanks. Lorddiggler.