I think it's preference and play style actually, otherwise the devs wouldn't slap the stats on the gear. I simply like having skill speed because that means I can get more skills on my target. Even if they would do less than someone with CritRate+Determination, the fact that they do enough as is and I can get more of them in makes me feel like I'm able to do more.

But let's be honest, it's just fun spamming all of them thrusts. :S