I'd say it depends on the tank job you want to level.
GLA/PLD has a lot of trouble holding hate below 50. Any little bit of STR you can get helps making it easier, and you can shield through dmg intense phases/hits with your defensive cooldowns, so having less VIT is not a problem, even with weak healers.

DRK and WAR don't suffer from the same problem, so you can smoothen things out with more VIT. I personally went full STR on both build and accessories (and even a bit on the left equipment side) and still didn't have any trouble. I even regularly asked my healers if they felt I was taking too much dmg or if healing me was stressful, but they all replied that it wasn't the case, so...VIT would have been a waste.
But if you feel uncomfortable with a smaller HP pool, it's fine to go for VIT instead
Just not as GLA..xD