Gains with Dreadrunner Sabatons:
120 Mastery (0.2)
183 Hit (0.54%)
Gains with Treads of Sanguine Volley:
321 Crit (0.54%)
160 Haste (0.38%
One last comment and then I'm gonna stop bickering. After looking at rings and comparing them I think the BiS rings for hunters are Kil'ruk's Band of Ascendancy and (as you said before) Ring of Restless Energy (not Ra-den's Swift Seal as I said, despite its agility socket bonus) since it allows you to follow socket color for a whopping +60 crit bonus.