When comparing Anima2D vs GAF:Flash to Unity, the Slant community recommends Anima2D for most people. In the question“What are the best 2D animation tools for Unity?” Anima2D is ranked 4th while GAF:Flash to Unity is ranked 9th. The most important reason people chose Anima2D is:
Everything you could want from a skeletal animation system, free and because purchased by unity promises to be native in future.
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Pros
Pro Purchased by unity
Everything you could want from a skeletal animation system, free and because purchased by unity promises to be native in future.
Pro Free
Pro Spring bones
Much like spring joints native to unity, you can set bones to have dynamic spring animations based on their parents.
Pro Can convert 99% of what can be done in Flash
GAF supports such Flash features as:
Masks support;
Filters support;
No limitations on timeline;
Conversion of shape tweens;
Frame labels.
Pro No need to use large Sprite Sheets
With GAF converter you get a highly optimized texture atlas and a config file. You don't need to take trouble over cumbersome sprite sheets. You can easily modify an already working in Unity animation and play around with the animations parts whenever you need.
Pro Alows using Flash animations in Unity
You can convert Flash animations directly in Unity with the help of plug-in. The converted .gaf file consists of a texturte atlas and a binary config.
Pro Supports different frameworks
Full playback API supported in Unity3d, Cocos2d-x, Cocos2d, Starling.
Pro Light, fast, and optimised
GAF is lightweight and fast in a project.
Pro Uses dynamic text
GAF can use dynamic text in animation on some platforms.
Pro Can customize sprite animation
GAF can swap a sprite with another.
Cons
Con No longer supported by Unity.
This has been merged into the 2D Animation package.
Con Uses the Unity hierarchy
It's impossible to rename your asset after making your animation, otherwise you lose dependencies.
Con Sound support available only in Premium version
GAF Converter supports sound but only in the Premium version.
Con Doesn't support sounds
GAF does not support importing audio along with Flash animations.