So my question is; Are t9 legs better then the ones I used before now with the setbonus or should I stay with http://www.wowhead.com/?item=47057 and don't care about the setbonus?
The stat difference between the two is really nothing more than a matter f choice or pick the stat your lacking, but that set bonus looks like pure goodness to me. It would serve you much better with Div sac/DG from the prot tree though. Why did you start going down ret and choose to take an extra %5 overhealing instead of %3 more crit though? The reason to go into ret is for the crit, which you would do just fine without IMO. do some theorycrafting and a little research and I think you'll find that set bonus is great but moving those ret points into the prot tree will make it that much better.