The numbers seems to be orders of magnitude better than MongoDB for YCSB .Arguably MongoDB is currently the most widely used NoSQL DB if I am not mistaken.In the past i have seen articles that Mongo is faster https://juristat.com/blog/a-comparison-of-mongodb-and-rethin.... Also the Wikipedia articles states that monho is faster https://en.m.wikipedia.org/wiki/RethinkDB

I have not used RethinkDB but used MongoDB in the past .Is there major advantage or disadvantage for RethinkDB over MongoDB?