When comparing Stencyl vs OpenBOR, the Slant community recommends Stencyl for most people. In the question“What are the best game engines for beginners and non-programmers?” Stencyl is ranked 11th while OpenBOR is ranked 33rd. The most important reason people chose Stencyl is:
Power users can also write code in Haxe (similar to Actionscript 3) to create their own custom classes and extend the engine.
Specs
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Pros

Pro Haxe scripting available for advanced users
Power users can also write code in Haxe (similar to Actionscript 3) to create their own custom classes and extend the engine.

Pro No coding required, great drag & drop interface
Visual scripting in Stencyl is based on the MIT Scratch project, which was designed to teach programming. Script elements fit together like puzzle pieces, ensuring that data and function types cannot be mismatched.
Pro Cross-Platform
Publish iOS, Android, Flash, Windows and Mac games without code.
Pro It's a NO-CODE Program, you can add logic without code
Pro The original concept for Ghost Song was created using Stencyl
The original concept for Ghost Song was created using Stencyl 3.x
Pro Great performance on every platform
Stencyl exports your games to native code so they have great performance on every platform.
Pro With a bit of tweaking, it's also possible to create a platformer
It's possible for a non-programmer who is comfortable with text-based designing to tweak the engine in order to create a platformer. Almost all the parameters needed can be found in the OpenBOR wiki, so it's easy to find anything a new developer needs.

Pro Great genre-specific engine
OpenBOR can quickly help create a good Beat-Em-Up game without programming.
Pro Great, supportive community
OpenBOR community is highly active and very helpful.
Cons
Con Not a powerful engine
Should be used for basic games only.

Con Only available via subscription
There should be an option to buy it outright, especially considering it is written by a one man team....this is not exactly an Adobe level enterprise with shareholders, so there is no excuse!
Con Slow release cycle
Con Updated
It needs much to improve for mobile games, it was left in the era of Flash games. In Android you can not even put the native keyboard, you can not access things like native camera, GPS or native text input.
Con Tile system is somewhat inflexible
Con Text-based parametric editing
Heavy reliance on text-editing. No visual editor to edit characters and levels (although there are a few community-built ones that do the job).
