imac is correct about VIT, but to put this in perspective...
...when he or I say that "VIT is better than Defense past the monster's Attack threshold," we're NOT necessarily implying that the return from VIT is a particularly spectacular one. VIT is a direct and linear reduction to base damage... a reduction of basically 1. Against something that hits for even 50 (which you will see by lv30 and it only goes up from there), a reduction of 1 is not much. Even with massive +VIT (rings/earrings/Gluttony/AF/etc.), you will only be shaving off enough damage to equal out to one up-to-date cure spell from your healer every so often. That's good inasmuch as that's our job, to take less damage and be more efficient to heal, but the return will not be grand.
It will simply be more than extra Defense gives you, which past the ATK/DEF=1 barrier becomes LESS THAN 1 PER DEFENSE, and indeed past a certain point less than 1 for even 5-10 defense. Thus, past a certain point you may find Phalanx Rings and their +20 defense (for two) don't shave 8-10 damage... whereupon +4/5 VIT rings (again, two) would be superior. But again, we're talking about all of 10 damage here. When we talk about the mathematic ideal defense, it's not going to be some grandiose difference between the ideal and the average PLD's VIT/DEF. It makes a difference, but it's very, very small.
Your ability to hold hate is much more telling than your statistical tweaking when it comes to being a tank. Yes, you will take less damage than most, and yes, it will be somewhat noticeable. But there is no magic +DEF/+VIT combo that will cut damage in half or anything.
Also, if Evasion only went up when you dodged, I sure as heck wouldn't be maxing Evasion every level after 3 fights.
edited for clarification
...when he or I say that "VIT is better than Defense past the monster's Attack threshold," we're NOT necessarily implying that the return from VIT is a particularly spectacular one. VIT is a direct and linear reduction to base damage... a reduction of basically 1. Against something that hits for even 50 (which you will see by lv30 and it only goes up from there), a reduction of 1 is not much. Even with massive +VIT (rings/earrings/Gluttony/AF/etc.), you will only be shaving off enough damage to equal out to one up-to-date cure spell from your healer every so often. That's good inasmuch as that's our job, to take less damage and be more efficient to heal, but the return will not be grand.
It will simply be more than extra Defense gives you, which past the ATK/DEF=1 barrier becomes LESS THAN 1 PER DEFENSE, and indeed past a certain point less than 1 for even 5-10 defense. Thus, past a certain point you may find Phalanx Rings and their +20 defense (for two) don't shave 8-10 damage... whereupon +4/5 VIT rings (again, two) would be superior. But again, we're talking about all of 10 damage here. When we talk about the mathematic ideal defense, it's not going to be some grandiose difference between the ideal and the average PLD's VIT/DEF. It makes a difference, but it's very, very small.
Your ability to hold hate is much more telling than your statistical tweaking when it comes to being a tank. Yes, you will take less damage than most, and yes, it will be somewhat noticeable. But there is no magic +DEF/+VIT combo that will cut damage in half or anything.
Also, if Evasion only went up when you dodged, I sure as heck wouldn't be maxing Evasion every level after 3 fights.
edited for clarification
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