Those are solutions for very different types of deployments. BDR is asynchronous multi-master, without global transaction management etc. XL is a distributed

Those are solutions for very different types of deployments. BDR is asynchronous multi-master, without global transaction management etc. XL is a distributed database with global transaction management, strong consistency, etc. Say you have geographically distributed application (managing customers in US, EU, ...). You can deploy a node in each area and direct local users to this node with low latency etc. It also means "no conflicts" (which is a major concern in multi-master), and the changes will asynchronously replicate to the other nodes. XL would perform poorly in this scenario (at least I believe so), and it's meant more for local deployments, when hitting vertical scalability limits.