Hi Daniel,
SDW 6.3 was just release and is still in "First Customer Shipped" status as opposed to 6.2.1 which is official "GA" .
There would be no reason to upgrade to 6.3 p1 unless you were looking for a specific burt fix or functionality.
Major difference between 6.3 would be the integration with VSC (aka SMVI) , SMSQL, and NFS datastores.
SnapDrive 6.3 for Windows includes the following major new and enhanced features:
- Support for performing Snapshot copy operations on virtual machine disks (VMDKs) in an NFS or VMFS datastore, which requires Virtual Storage Console 2.0.1 or later. Please check the availability of Virtual Storage Console 2.0.1 and install it before using this feature.
- Support for space reclamation when using VMDKs in an NFS datastore
- Support for DataFabric Manager caching with RBAC
- Automatic download of the storage system access control (storacl.exe) tool as part of your SnapDrive 6.3 for Windows installation
- Bug fixes
For more information, see the SnapDrive 6.3 for Windows Release Notes.
If you need any of this then you would need to upgrade, otherwise I would stick with 6.2.1 for the burt fixes available.