Like eli81k noted, in 2003 Santana went 11-2 with a 2.85 ERA, 109 Ks and only 27 walks in 110 innings as a starter (18 starts).
Webb on the other hand was 10-9 with a 2.86 ERA, 171 Ks and 67 walks in 179 innings as a starter (28 starts).
Santana was unbeaten in the final two months of the season (Webb was 3-5 in the same period of time).
Johan Santana is the guy you want on your team.
Mike Pelfrey > Matt Garza