When comparing BagelDB vs Kuzzle, the Slant community recommends Kuzzle for most people. In the question“What are the best alternatives to Firebase?” Kuzzle is ranked 3rd while BagelDB is ranked 10th. The most important reason people chose Kuzzle is:
Supports REST, WebSockets and MQ protocols.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Great UX
Pro Small learning curve
Pro Real-time data
Pro Nuxt.js Vue.js Libraries
Has an incredible Nuxt.js library.
Pro User login
Has user login with super simple access control, that integrates seamlessly with the data.
Pro Multiprotocol
Supports REST, WebSockets and MQ protocols.
Pro Realtime through filters
You do not connect to classic rooms but to search filters and can be warned of changes on permanent storage or volatile one.
Pro Open Source
Kuzzle is open source and it's released under the Apache 2 License.
Pro Javascript SDK
A fully documented javascript SDK exists.
Cons
Con May have issues since it's stil la relatively young project
Kuzzle is (as of February 2nd, 2015) in alpha version and approaching beta.