One problem is that, if you accept the commonly accepted timelines with regard to usage for the two guys, Bonds was already more or less the best hitter in baseball when he began using in the 1998-1999 offseason in response to the breathless coverage of the McGwire-Sosa race. Clemens, on the other hand, was sliding toward Palookaville when he began using before joining the Blue Jays and reviving his career. The ten most similar players to Clemens at that juncture (Hall of Famers noted with an *) were: [*:2rotin22]Dwight Gooden[/*:m:2rotin22] [*:2rotin22]Bob Welch[/*:m:2rotin22] [*:2rotin22]CC Sabathia[/*:m:2rotin22] [*:2rotin22]Tom Glavine*[/*:m:2rotin22] [*:2rotin22]Bob Gibson*[/*:m:2rotin22] [*:2rotin22]Tom Seaver*[/*:m:2rotin22] [*:2rotin22]Lon Warneke[/*:m:2rotin22] [*:2rotin22]Greg Maddux*[/*:m:2rotin22] [*:2rotin22]Justin Verlander[/*:m:2rotin22] [*:2rotin22]Jack Morris[/*:m:2rotin22][/list:o:2rotin22] If you think of his most likely career track without the dope being something like an average of these players, it's still an open question what kind of career he'd've ended up with. Four Hall of Famers are on that list and two guys still active. And I'm not saying some of those latter-day players didn't use. Now, Barry Bonds thru 33 gives us a more starlit, albeit messier, set: [*:2rotin22]Frank Robinson*[/*:m:2rotin22] [*:2rotin22]Ken Griffey*[/*:m:2rotin22] [*:2rotin22]Duke Snider*[/*:m:2rotin22] [*:2rotin22]Vladimir Guerrero[/*:m:2rotin22] [*:2rotin22]Juan Gonzalez[/*:m:2rotin22] [*:2rotin22]Jeff Bagwell[/*:m:2rotin22] [*:2rotin22]Jim Thome[/*:m:2rotin22] [*:2rotin22]Mickey Mantle*[/*:m:2rotin22] [*:2rotin22]Willie Mays*[/*:m:2rotin22] [*:2rotin22]Manny Ramirez*[/*:m:2rotin22][/list:o:2rotin22] Five Hall-of Famers, plus a couple of guys who should skate in. A lot of other drug-clouded guys, but this could be eight or nine guys in a few years, maybe 10 eventually. Anyhow, that's one way to distinguish them, if you're of a mind to distinguish them.