First of all, I’ve to admit vSphere Replication seems to be nice products capable of meeting variety of end users’ expectations. Nevertheless, even the good product might have several limitations. So, here are my 2 cents regarding comparison VR and VBR, or more specifically, short list of VR limitations (from my perspective):
• vSphere Replication provides single restore point only. It can be considered as a limitation number 1.
• Lack of failback functionality.
• No traffic compression.
• No traffic throttling.
• No network customization (network mapping).
• No re-IP upon failover.
• Basic VSS quiescing (no application-aware processing, which is necessary for replicating VM running VSS-aware applications (such as Active Directory, Microsoft SQL, Microsoft Exchange, SharePoint), since this functionality guarantees backup transactional consistency of such VMs).
• Works within single vCenter only.
Hope this helps.
Thanks.