Do you need a tool to help you with your software configuration management (SCM) or your version control [system] (VCS)?
That's what the ClearCase vs Git discussion boils down to.
So to speak you are comparing apples to oranges.
Thinking of ClearCase as just another VCS is a narrow view of what ClearCase is; stick with ClearCase if your goal is shipping the right product out of your shop.
On the other hand Git is probably the best VCS on the market at this moment, (though it does not offer any SCM support) so you switch to it if your concern is branching and merging .... (a side note the merging conflicts are the result of a poorly set base line and improperly configured views) ... VOB replication sucks - I give you that.
The drawback of your planned move is that you will throw away your SCM tooling support. And you will have to face a myriad of other tools and lots of manual work to achieve what you had out of the box with ClearCase.
Anyway a good VCS is the backbone of any SCM, so your move to Git might payoff in the long run.
