Leavitt has the far superior resume to Venables, IMO. For one, he has a spectacular record of achievement as a head coach. Venables would be a risk, as we don't know how he would fare as a HC, and he has had the benefit of great talent as a DC both at OU and Clemson.
And then Leavitt's work as DC at Colorado, with average talent, just further enhances his status. Without him, we saw what Colorado was like in the bowl game. It was Leavitt who built the culture there.
No secret that while he was at South Florida, schools like Alabama and Miami offered him.
Leavitt has that issue of the alleged hitting of a player at halftime of a South Florida game, which got him fired, but there are tons of players who support him, and say he got a raw deal...