It's also not a fair comparison, because, as a whole, the NL sucks. The AL has much more talent and better teams.
IMO...the Yankees, Redsox, A's, Angels, are better than ANY NL team, and the Whitesox, Twins, and Rangers are not far behind them!
BTW...if everyone was healthy, and you were making a starting rotation out of the Cubs and Sox staffs, Buehrle would have to be #1.