General interwebs consensus is C158 > 9310 > 8620 but you know how reliable that kind of info can be. Honestly, I don't have enough knowledge about different steels to give you a better response. JP does have a sterling reputation tho, which counts for something, on top of that all their products are high quality competition stuff.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul