When comparing UXPin vs Noodl, the Slant community recommends Noodl for most people. In the question“What are the best tools for prototyping mobile interactions/animations?” Noodl is ranked 11th while UXPin is ranked 12th. The most important reason people chose Noodl is:
You can use REST API to get data to your prototype.
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Pros
Pro UXPin has great advanced features for prototyping
integration if this then dop that and custom javascript functionality
Pro Actively developed
UXPin is constantly being updated with new features.
Pro Import from PhotoShop and Sketch
A pro UXPin account will allow you to import existing projects from PhotoShop or Sketch.
Pro Extensive library of elements and patterns
UXPin offers elements from a wide range libraries. This includes responsive frameworks such as Bootstrap and Foundation, and libraries specific to mobile prototyping.

Pro Use external data
You can use REST API to get data to your prototype.

Pro Free

Pro Cross-platform
It is a Chrome app and you can test prototypes on any device that supports WebGL or Canvas.

Pro Prototype two-device (master — companion) apps
You can setup communication between two devices.

Pro Components
You can build one interactive component and then reuse it with different input values (like images, txt, width, speed — any value you can imagine).
Cons
Con Expensive subscription model
$29 per user/mo ($350 pa) will soon rack up compared to a standalone product like Axure PRO ($450) which has a license that lasts years (they have given out free updates for the last 2 versions).
Con Steep learning curve
UXPin is one of the more complex prototyping tools. Combined with a lack of documentation, it can be discouraging for first time users.
