WTF? I asked a simple question: Has anyone done testing to find out the frequency of block and parry. What you linked has nothing to do with that.
If you aren't interested in this information.. then don't read it?
I don't see how asking a question makes me a douche. Or how pointing out that you linked something that had nothing to do with the answer to the question. Much less something that I already mentioned in teh OP as not being what I wanted, or something others had already posted (and been told it wasn't the the desired information.)
Not that its relevant, but I have been working on a in depth analysis of mitigation over time between the two tanking classes, but there is no way to calculate the actual strength of paladin's blocking if we don't know frequency. Someone already gave sample math on this, but let me elucidate:
So, for sake of argument (and this isnt' actually what the numbers are, but lets just assume they were) lets say both classes can, over time, reduce exactly 10% of damage over time via their cool downs. Given that the two classes have the same effective hp (barring a few points of vit since war naturally has a little more, but that's pretty trivial) and paladins 5% healing recieved advantage (20% damage reduction = 25% healing recieved increase vs 20% from defiance), it would seem to suggest paladin has a slight but fairly marginal advantage over time.
What we haven't accounted for, though, is "natural" mitigation. War Parry vs PLD parry & block.
What if: War has a hidden 20% chance to parry bonus, and you only block 10% of eligible attacks. Assuming 24% reduction on parry and 27% reduction on block, warrior would naturally mitigate an extra 4.8% via their parry advantage, and paladin only 2.7% via blocking. Warrior would have a 2.1% advantage.
What if parry is the same, and blocking is 20% chance? Then paladin has a 5.4% mitigation over time advantage.
This has nothing to do with tiers. I'm not sure where that tangent comes from. As to the "tiers" on block and parry mitigation amounts, I'm inclined to believe the game only shows us whole numbers but actually reduces by a decimal amount (shows 24%, actually stops 24.5% for example) based on where your stats are in a progressive fashion (just as the community rep said).
Also, everyone is talking about Onion shield vs Holy Shield Zenith, saying Onion mitigates more over time. This may be true... but we cannot possibly know it unless we actually know the frequency of block rates. Example: Lets just assume Zenith blocks 20% of attacks, that would be 5.4% mitigation over time. To get the same mitigation over time out of the onion shield (which someone said mitigates 20% per block) you would need to have a block rate of 27% with the onion shield. Without information regarding block frequency, it is impossible to quantify the effect of blocking in general, or make a meaningful comparison between any two shields of differing block rates and strength.
This also impacts bulwark's efficacy. What if the onion shield has a block rate of 42%? If bulwark is simply additive, as the tool tip suggests, you would have a block rate of 102% making it an extremely reliable cool down (in this case equal to rampart's mitigation). What if bulwark isn't additive, but rather if you miss the block chance gives you a second block chance at 60%? still strong, but not 100%.