What's the difference between vss-web-extension-sdk and azure-devops-extension-sdk?

[GiriB]

The ReadMe for both the projects - vss-web-extension-sdk and azure-devops-exntension-sdk - say that they are client SDK for developing extensions for VSTS (now Azure Devops).

Why are they two different SDKs ? What's the difference? And what is the recommendation if I'm writing a new extension? Which one should I use?

Sadly I couldn't find any documentation explaining the above

Ref: microsoft/vss-web-extension-sdk#149

[Hack3l]

As far as i can tell the vss-web-extension-sdk is the old version and they renamed it, probably because of the name change from VSTS to Azure Devops.
Here there is information on how to migrate from the old SDK to the new one.