Oh, I noticed it but I disagree.
The advantages of str are great, you take more hits and need less hits to kill enemies (you might not notice this vs an individual because you do 80% instead of 70% per hit, but in a group this really shows). Swing speed is nearly identical, for agi build you get more movement speed. Which should not be underestimated but I'd consider high str better killer build, while agi is more a skirmisher.