"The only people that ever say 'sFlow is better than NetFlow' are those that haven’t used both and seen the difference for themselves".
"If all you have are sFlow-enabled devices you should still look into turning on sFlow exports. It’ll give you traffic stats and other bits of info that are better than nothing at all .. The NetFlow vs. sFlow war is over. Someone should let them know. Perhaps this will help"
See "NetFlow vs. sFlow for Network Monitoring and Security: The Final Say" - here.