I've been reading a lot lately about how much tougher it is to pitch in the AL than the NL. Particularly on one well known Boston message board. The examples cited are:
Bronson doing well in NL (which can't be right because the Redsox let him go)
Lowe doing well in NL (which can't be right because the Redsox let him go)
Pedro doing well in NL (which... you get the idea)
Beckett doing poorly in AL (...)
This has also been picked up on by Boston fan.. err.. ESPN writer Bill Simmons:
And maybe the inferior quality of the National League plays a bigger role than we realize; we've seen too many NL guys switch leagues and flounder, and too many AL guys switch leagues and thrive, and if you don't believe me, look at Josh Beckett's home run stats over the past few years compared to 2006.
Of course Curt is doing fine in the AL, but never mind...
Now, don't get me wrong. There is obviously a difference and I'm actually very interested in what this difference is.
My questions is, which statistic would give you the best comparison between pitchers regardless of league? (preferably accessible on the web for free, but anything is fine)
I've looked at WS on The Hardball Times, but I'm not sure if this is a good start. How about VORP, RC?
Thanks for any feedback...
(BTW, nothing but love for SoSH
edit: added link