non relation database

I have more so an opinionated question but I am looking for a good databse, non relational, to use to store parsed json information from har files for my wpt private instance. In your opinion from a webpagetest/php stand point, what databases would you recommend. I’ve had some experience with couchdb and cassandra but are there any other db’s that would work as well if not better?

Patrick Lightbody (Neustar) and Jan Honza Odvarko (Mozilla) have been talking about something similar (but for archiving the HAR files themselves). Maybe worth asking over on the Web Testing Framework group: