The problem with this whole Str/Vit debacle is that there's no specific right answer simply because both stats are helpful and both do different things.
Yes, in most cases Strength will be the right choice. But you're giving something up. You're giving up a pool of Effective Health. In most cases it wont make a run easier and certainly wont make it faster unless it's the difference between a healer getting enough time to fire off some aoes on big packs. But still... you're giving stuff up.
And that just feels sucky for a tank. DPS and Healers don't have to give anything up, they just constantly increase their entire effectiveness by wearing one set of gear. It's awesome to increase our strength, and do as much damage as possible. But it's also nice to get tankier and tankier as you go through content, and because most tanks start off with a mix of str/vit as they delve into content they're undergeared for or unfamiliar with, it means that as they gear up they swap out vit for strength and never really feel the full effect of being tankier.
I'm certainly not advocating full vit. I'm very much in the Strength camp myself. I just wish people would stop making sweeping statements about a one-size-fits-all mentality for tank gearing, and also understand that even the tanks that stack strength will have that annoying feeling in the back of their mind that they're giving up stats that do in some way help the role that they're brought along for.
