Unfortunately IT world messages
in favor Windows 10 Enterprise, this is
the half truth.
Probably the one to blame here
are a few idiots at YouTube, which hope to collect views at their counters.
W10 Enterprise this is exclusively sold by Microsoft. Such licenses they are not offered at Retail Small business, at least in Greece.
The major problem with this version of Windows, this is that
You Will Be Unable to prove
legal license ownership, in a case of an inspection.

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They are
a few anonymous websites, these selling all sort of activation licenses.
But if you do read their
LEGAL Notes, the one bellow
this is based at Hong Kong - CHINA.keysfan.com, Inc ...eu.keysfan.com...

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I do not either think eBay sellers, as an more reliable source.
Naturaly eBay its a safer market place, you will get an activation key.
Still, it may come one day, that Microsoft or a local authority it might request from you proofs of onership.
And or proofs that you legaly optained such a license (activation key).
In sumary, the use of Windows 10 Enterprise outside of very large companies, this is like walking in the dark regarding
legality.The worst that might happen, if you activate a workstation
by you buying just a working key and not a license.
This is Microsoft one day to block this key, and break the activation.
Then you will end up with nothing, because W10 Enterprise installation
this cannot be downgraded to W10
regular Home or Pro versions.
You will be forced to Delete this OS from your PC, and to start over from scratch.