1) Brad Childress, based on the numbers in almost every single category listed, has shown to be the superior candidate. The trouble there, however, is that he hasn't had been the full-on offensive coordinator of a team since 2012 in Cleveland. Much of Childress' success can be considered outdated based on how the game has evolved.
2) Greg Olson has had little success recently, except in 2015 when the Jacksonville Jaguars set his career record (3rd) for the highest ranking in passing touchdowns for one season. Other than that, Olson's offenses have been below average but has continued to get opportunities to lead an offense. He has had some success developing quarterbacks -- as had Childress -- which is part of the explanation.
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