Helix Versioning Engine is a native DVCS. This is in addition to a Git management solution that is part of the solution. Choice of workflow, combined with efficiency in large file, large repo handling -- definitely interested in solving the problem right, instead of using band-aid.
The primary difference is in the interface (SQL vs NoSQL), the transactional protocol, and capabilities such as built-in multi-tenancy, temporality..
Might be useful to note that GV invested in both (Fauna was after Cockroach).