Threat: Expertise vs Strength (gemming)
Not that I would ever gem for strength, but I have seen some do it. And it's made me wonder, what is the relationship between the amount of threat you put out between strength and expertise (rating) for a warrior tank (other tanks are welcome also)? Since the food buffs are 40, let's compare 40 expertise rating to 40 strength.
Additionally, I know expertise provides a value other than threat. Let's not mention that for purposes of this discussion. This is a discussion about threat. Mentions of damage (dps increases from either stat) and mitigation (strength to SBV conversion) are also valid.