User blog comment:Emptylord/Archived/PBE Patch Notes (Preseason 3)/@comment-5819230-20121203163007/@comment-5490997-20121203175258

Actually, Randuin's active loses the AS debuff. So it's only an AoE slow and only slows AS if you get attacked (Warden's passive).

But I agree, Randuin's will be a better pick than Sunfire in most situations, but in my opinion it has always been that way. Actually, I think in S3 they will be closer than they were in S2. And look at it this way, now you can get 2 items with a nice amount of armor and HP instead of only 1.