while prior is indeed the best pitcher in the game (in my humble opinion), and obviously the best young pitcher in the game.. a healthy oswalt is, i'd say, in the top 3 best young pitchers in the game.
who has the best winning percentage of all active pitchers with 50 or more career decisions?
seriously his era could be low threes or mid to high twos, and he's a damn good pitcher. i think prior is better than him, but not by an amazingly huge margin. if shawn green somehow returns to 40/100 form, you just might be kicking yourself for making that trade, if shawn green sucks, then yeah, i'd rank a healthy prior over a healthy oswalt.