This presentation gives an overview on OrientDB and Neo4j. It also compares some specific querys, their speed and the overall functionality of both databases.
The querys might not be optimized in both cases. At least they have the same outcome and are both written as querys. For sure in Neo4j you should do this in Java code. But that is way harder to write, so this presentation is more like a direkt comparision instead of really getting the best results.
Also it's done with real data and at the end round about 200 GB of data.