I've never really seen the point of kicking deep in this situation. Your choices are either:
(1) Kick deep, have to stop them on defense.
(2) Kick short. If you recover, bingo. If you don't, you have to stop them on defense.
Basically, all you lose by going for the on sides kick is field position (either way you have to stop them), and you gain the opportunity to recover it.
I guess the math maybe changes in denver, since the Broncos might already be in FG position if they recover the on sides kick.