Excavators/trucks etc - lifting and moving with hooks/chains

There are a fair number of truck mounted palfinger type cranes around and most of them (well, the ones that I have seen) have the hook at the end of the final boom section. I have not seen too many with a winch at the end. Is that because there are different driving/operating regulations for those with a winch compared for those with just a hook? Do they fall into a different category for operating?

Cheers,

DMN