Lidge is making the decision about what to do when Storen comes back easier.
He's also making it easier to make the decision about what to do before then. I still prefer HRod in the setup role, but he deserves the call in the 9th now more than Lidge. All closers blow saves, and I can deal with the HRs. The walks are the problem to me. When Hrod looks like he has better control than you, you have a problem.
Lidge has the advantage of experience and mental fortitude. All a closer needs to do is throw strikes. If he can't, he can't be trusted.