Neo4j is a good choice as well and I did use it too. In the end, I chose Dgraph simply because I was curious about understanding in depth the source code and at the time Golang was my language of choice for a deep dive into how to implement a graph database from the ground up.
I really like the Cypher query language from Neo4j. Really hoping that Dgraph will have support for it in near future (it's on their roadmap: https://github.com/dgraph-io/dgraph/issues/1966 )