Mussina was 270-153, 3.57 in an historically offensive era, with 83 WAR, according to BB-R's formula. He threw 3,562 innings and another 2/3 of a season of a post-season ball, going 7-8, 3.42. He consistently got 17-19 wins before finally winning 20 in his last season and then hanging it up, the first player to retire after a 20-win season since... Sandy Koufax. Smoltz got 69.5 WAR, though BB-R probably undervalues relief pitching. What puts him over the top is probably his post-season record. While Mussina was solid to good, Smoltz, in 27 starts and 14 relief appearances, was great, going 15-4/2.67, with an additional four saves. The difference in WAR is notable to me. But Smoltz's between Smoltz's post-season edge and my notion of relief being undervalued by WAR, I'd have to call them pretty close. They have a pretty similar class of comparables, with a lot of the same names appearing on both lists. Most Similar to SmoltzMost Similar to MussinaCurt Schilling (876)Kevin Brown (867)Jim Bunning (864) *Luis Tiant (863)Orel Hershiser (859)Bob Welch (855)Jim Perry (848)Catfish Hunter (848) *Billy Pierce (841)Don Drysdale (841) *Andy Pettitte (912)Juan Marichal (866) *David Wells (863)Curt Schilling (860)Jim Palmer (855) *Carl Hubbell (855) *Kevin Brown (844)Tim Hudson (840)Jack Morris (838)CC Sabathia (837) Both lists are filled with borderline candidates, but I'd say Mussina's is a slightly stronger field of borderline candidates. And of course, the similarity scores don't account for era. Funny that Mussina gets a handful of lefties on his list.