Cold clone does provide a cleaner conversion because you do not have to worry abbout what might be running in the OS but it is not necessary faster - the most common cause of slow {2V tends to be the network infrastructure - Live migrations using converter work fine as long as you prepare the source machine by running a defrag, stopping antivirus services and disabling other services that are can interfere with the migration -
In regards to converter you do not need an enterprise version to down load the standalone converter which will include the the converter boot cd -