Norton's small business product is different in many ways from its consumer peers.
Besides having the same virus, spyware, and other malware protection offered in Norton Security (and Security with Backup), the Small Business version also has better support.
Most importantly, it includes Norton's "Virus Removal Assurance."
This means, if any of your PCs are infected while you're running their software, you can opt to have one of their experts remotely remove the virus for free from those PCs.
If they can't you get your money back.
Aside from this, the software also has generous licensing, too.
With it you can secure five PCs, Macs, or Android devices. (Adding more is easy if you need to.
If for no other reason than their Virus Removal Assurance, it's worth considering.