So, the Big Hit is a high end mountain bike with full suspension? (That's what looking it up tells me.)

If so, get a hybrid. Mountain bikes with slicks do make great commuter bikes, but on the road suspension hurts you more than it helps. And from what I can see, a Big Hit costs several thousand dollars -- might not want to lock it up while you work.

But if you had a cheaper mountain bike with no suspension -- I'd say go for the slicks.