When did anyone compare the two?
They are two top-tier (max-tree) buffs that both should be applied tactically. At least that was the intent of the update.
And the only reason I suggested make it max-at 15 seconds is because UM at levels 1 and 2 (which level 37-42 barbs often use) is like 5 or 6 seconds and a waste of mana for them for that short of a time. So I'd suggest upping it at 5 to 15 seconds so at least at level 1 it's 10 seconds or something. Or just make 10 seconds for all levels since they vary in % to resist.
I never compared their intent or their results, but the fact that they are both DEFENSIVE in nature and both TACTICALLY applied. I find they are both used in the same situations: coming out of a fort to defend the door and charging an enemy in the open.
It's called a suggestion, ya don't have to agree with it but over-analyzing it and turning it into something it's not is just silly.