@Monolith. The error in your thought process is that you presume that tanks or healers care about TDR. Damage reduction with no predictability and low occurance, high effect (a.k.a. dodge or parry) are most often completely wasted into overhealing, and provide no real benefit. The only exception to this rule in this tier is Tortos bats, which is the only valid fight for dodge or parry as defensive stats.
Same goes for Colossus. It is so small, and given the amount of time that tanks spend at 100% health, over 90% (That is a generous number, probably closer to 95) of the colossus procs are completely wasted into overhealing and have no real effect.
So really, both of those enchants are completely useless for tanking purposes. This leaves two choices. Dancing Steel and Windsong.
DS purely for the attack power from it. I used to prefer DS in T14, due to having lower vengeance numbers, aswell as so many bosses that stopped melee attacking you. In this tier however, there are so many solo tank fights, atleast in normal, and so many fights where it is duo tank (as in both tanks active, not 1 tank on boss and 1 tank jerking off in a corner).
This has caused me to now favor Windsong over DS as it is on MOST fights, a much larger dps increase than DS.