I did the multi-step migration/upgrade of Windows Server, SQL server and vCenter version, and although it was a real pain with a lot of unanticipated problems, I was happy with the result. Just do the changes one at a time, and you'll be fine.
Unless of course you think your current vCenter Server DB has some problems that you would like to get rid of. In that case I recommend you start fresh and move the hosts and VMs VDS->VSS->new vC->VDS.
Good luck!