Table copies in hbase

[Sumit Nigam]

Hi,
I have a a few tables in hbase which I would like to create copies of. The 
tables will be in same cluster.
I wanted to know based on experience, which one of the options is better:
1. copyTable2. snapshot3. Any other?
Besides efficiency aspect, I am also interested in knowing what happens when 
the operation fails midway copying from snapshot to destination table. Or when 
it fails midway copying to destination table in copyTable option. Would data be 
left in inconsistent state?
Thanks,Sumit