Chris Collingsworth is easily my #1 color man - intelligent, witty, insightful, and informative.
Generally, I find him far more interesting than the others, delivering his on-point commentary in a relaxed/laid-back manner.
As for the others..
Troy Aikman, who imo represents the epitome of "average" as far as sports commentators goes, never offers up anything about the players or the game that I don't already know (i.e. "Captain Obvious").
And finally, there's...
Jon Gruden, whose main purpose on TV seems focused more on perpetuating his caricature/alter ego "Chucky", than enhancing
the broadcast in a meaningful way.