STR is best stat not only cause of dps but also for the key role of the tank in general to hold hate.

Many tanks fail to understand more STR = more effective flash enmity too and the only tank that needs to flash really is pld for obvious reasons.

Additionally cause plds str modifier lacks the same enmity potential as DRK or WAR they should gear more STR than VIT gears after all you have a shield and block beats parry unless wars in tank stance...