When comparing Couchbase vs ArangoDB, the Slant community recommends ArangoDB for most people. In the question“What are the best databases to use for Node.js applications?” ArangoDB is ranked 9th while Couchbase is ranked 12th.
Ranked in these QuestionsQuestion Ranking
Pro Ability to run ad-hoc SQL like queries on realtime big data
Couchbase N1QL allows native SQL processing over JSON data with high performance indexing for low latency queries at scale.
Pro Open source
Couchbase and Couchbase Mobile are open source and released under the Apache License.
Pro Ability to make predefined fast queries
With Couchbase you can make "Views" of data, which are practically predefined queries which are fetched with an O(1) algorithm.
Pro Easy cluster setup
Pro Supports joins
Unlike many NoSQL databases, ArangoDB does support joins in AQL queries.
Pro Powerful Java Driver (Sync & Async)
ArangoDB has a very good Java Driver for synchronous and asynchronous. In addition the team there is working on a Spring Data integration.
Pro Transaction save
You can use ACID Transactions for short and small data retrieval and/or modification operations in ArangoDB.
Pro Document and graph-orientend
You can model your data as documents or as a graph - no data model lock-in. You can even combine both models and use them in a single AQL query.
Con No model mapper for Android
Couchbase does not have a model mapper for Android built-in and out of the box, instead you will have to write your own from scratch.