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From user forums:

• If you are going to do anything significant with Neo4j, you'll likely need HA, and that is big time $$$.

• The community around Neo4j is more mature, especially in the US
• You can get classes, etc from Neotechnology pretty close to you home, I'd guess. Also, many of the Neo4j devs are accessible via groups/skype/etc. It's a good community. OrientDB, basically, has a Google Group. The devs are responsive, but it's not as lively.

• They both use Gremlin, but Neo4j also uses Cypher. OrientDB has a more SQL-ish query language

• OrientDB has a binary protocol, and Neo4j does not. This is a big one for us, as it means we can have >1 clients on an instance without dropping to a REST api or using HA.