Lightstream is single node only, effectively a remote WAL for point in time recovery, this is multi-node and eventually consistent. You can write to nodes while they are "off line" and sync later.

This is geared towards, say, having an application running on a device on an airplane, maybe a passenger CRM. You can have it run and update the DB while in the air with no connection, the DB will then sync with main node once on the ground with a connection.