As most people are probably aware we have 2 main types of Manastones available to increase our damage and those would be +Physical Crit or +Attack.
There are a few different tiers of these, but the ones that will matter the most will be these...
http://www.aionarmory.com/icons/l/352936.gifManastone: Attack +5
http://www.aionarmory.com/icons/l/352936.gifManastone: Physical Critical Hit +15
Now which ones or what combination of Manastones will yield the highest damage with our skills? Also another thing to consider is which classes might benefit from +Attack more then +Critical Hit?
From what I have read 10 critical rating is approximately ~1% critical strike chance while +Attack is still unknown where it factors into the damage equation and if multipliers like Devotion have an effect on it where as critical rating affects everything.
It also seems to be commonly accepted that there is a so-called soft cap on critical strike rating of 440 which any rating added after this cap will yield ~1% critical strike per 20 points of rating rather than 10 and in essence cutting the effectiveness of the Physical Crit Manastones in half. I see this soft-cap discussed on the Ranger forums on a few other sites but I am not sure how Gladiators/Templars/Chanters/Assassins/Clerics are affected by this but I would assume they have the same number for the soft cap for Physical Crit at least.
It seems that most Korean and Chinese players who have had level 40+ characters have started filling out their equipment with +Attack when they hit the soft cap for crit which seems like the best way to go but we won't know for sure since Aion's crit system is a bit absurd with its multiplier when you can crit for 400 on a wolf and turn around using the same skill a moment later and crit for 2500 damage which I have personally done.
I will be doing some tests when I get 50 as anything results beforehand would be skewed without having all of your passive skills, level 50 stats, and maybe level which might affect how the formula for deriving damage is determined and I am only 36 right now so it might be a while. In the meantime if anyone wants to expand on this or might have some additional information on the subject please post and let us know what info you might have.
-Syntex