Best tank to pair with monk?

[Rongway]

Monk can go with WAR for the insane Mantra+Convalescence+Defiance healing boost.

Only if you want to see big numbers. For actual effective healing, PLD receives more eHP per heal than WAR.

I've been told that PLD is about 4% easier to heal than a war. I hope this is still true since that's what I've been parroting.

PLD gets -20% (0.8) damage taken with Shield Oath and WAR gets +25% (1.25) max HP with Defiance, and those are inverses of each other (1/0.8 = 1.25, 1/1.25 = 0.8).

WAR gets a 20% (1.20) healing boost with Defiance.

JOB                    PLD              WAR
Max HP                 10000            12500
Taking 5000 hit        -4000(Sh)        -5000(Df)
                       =====            =====
Remaining HP            6000(60%)        7500(60%)
 

JOB                    PLD              WAR
Max HP                 10000            12500
Receiving 5000 heal     5000             6000(Df)
Percent of max           50%              48%

Considering just tank stances, they take the same effective damage but WAR receives about 4% less effective healing.