Just mythic procs, cause they have 30% chance. Legend procs have only 9% chance on PVP, which means they will almost never proc. Epic Skills affixes are very good, unlike you're saying, cause they increase your skill damage by at least 15% damage (this is usually better, because they also increases APS, hit frequency, etc.). Now tell me: Can you list how many affixes gives 15%+ damage on PVP? You won't find too many of them.