When comparing Kuzzle vs Kinvey, the Slant community recommends Kinvey for most people. In the question“What are the best alternatives to Firebase?” Kinvey is ranked 2nd while Kuzzle is ranked 3rd. The most important reason people chose Kinvey is:
When you want to upload a file, you just create an object and initialize the file upload to the server (this is done asynchronously).
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Pros
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.
Pro Asynchronous file uploading
When you want to upload a file, you just create an object and initialize the file upload to the server (this is done asynchronously).
Pro Provides a straightforward way of connecting their services
Setting up a backend for an app with Kinvey is very easy and takes minutes. All you have to do is sign up and through their graphical interface follow all the steps, which boils down to creating tables and identifying the type of data that is being stored.
Then you download the library, integrate it with your app and initialize the process with one single line.
Pro User registration is easy
User registration with Kinvey is pretty good and usually works without any problems. It's also very easy to use, you simply pass the username, password, email, etc. to the required method and register a callback that returns whether the registration was a success or a failure.
Same thing is done for login and logout as well.
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.
Con Costs are eye-wateringly high
The free tier is not that generous and as soon as you trip the paid tier it costs you thousands a month.
Con The free plan isn't that good
Kinvey's free plan only includes the first 1000 users for free, 5 million push notifications (which admittedly, is pretty nice) and 2GB of storage.