The latest Storage SDK version is now v12, which you can find in the Azure SDK repos:
You can also find migration guides in the repos which detail the migration benefits. The SDK has now split into separate ones like Storage Blob, Storage Queue, etc. The following are migration guides for Storage Blob. You can find the guides for the others in the repos as well:
Finally, there are Changelogs for the new SDKs in the repos as well, which you can reference to see what fixes/changes are done. The following are Changelogs for Storage Blob. You can find the logs for Queue, Datalake, etc. in the repos as well:
It is recommended that you use the latest SDKs since those are the ones getting the new features as well as bug and critical fixes whereas the older libraries will only be getting bug and critical fixes. Read more about Azure SDK lifecycle and support policy