I like it for analyzing how our equally geared full prot war takes damage in comparison to me. He favors avoidance, I favor stam / armor. Though we both like armor, dodge, stam, etc obviously. I just mean subtle preferences, like +51 stam trinket or moroes +dodge trinket, devilshark vs. guilded thorium cloak, etc.
Here's a side-by-side of our last void reaver kill, which is a great place to see comparison in your tanks because it require mulitple tanks, which should be taking around the same number of hits due to the aggro dump. There's loads of info to evaluate tanking here. You can see that on each hit that landed, I took 3080 damage on average per hit compared to his 3220 , and we both have around 50% total avoidance. I took 0 crushing blows, he took 5. He mitigated more spell damage than me, by about the amount expected when comparing def stance to righteous fury for spell damage.
I have more examples, but it's often a very close comparison. Hopefully I can show that there is no magical difference between damage intake of paladins and warriors unless it's a difference in gear, like armor, stam, avoidance, etc. Assuming their close, which me and our prot war are, the damage should be near the same minus a 1%or 2% variance. In this case, it weighs in my favor. In others, it does not.

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