I've used both and Silver bear is just as dirty. It's definatly hotter and has more FPS then Wolf but is about equivelent in any other category. I will warn you that Silver Bear does use a laquer sealer around the necks. Some guns just choke on the stuff. I've never really had problems with stuff but I still clean the sealer off with solvent. All in all, the Silver Bear is better if Wolf short strokes in your rifle. But other than having a hotter load, Silever Bear is more expensive, harder to find and has that stupid laquer sealer.
About one of the few places that still carry Silver Bear is Cheaper than dirt and it's almost $3.00 a box for .223. Other than that, I haven't seen too many people still carrying the .223 variety. Ammuntion store does carry some pistol cartridges and I have seen Sportsman Guide with some .308 at reasonable prices.