Which nebulite should I mount on my weapon?

I also would like to know which one is better not for a weapon, but for a Top.

It's a 17 luk top 3L unique 6% all stat 6% mp 6% luk.
Should I put a: "Luk+ 2%" or a "1 sec+ god mode after being attacked"

I know it's obvious that % LUK helps for dmg, but I would like to know if the benefits of the +1 sec are better overall.
Yes, my question is not for a weapon, but I don't think anyone would want to have a thread everytime someone has these type of questions. Maybe we can dump them all in this thread? xD