When comparing GAF:Flash to Unity vs Creature, the Slant community recommends Creature for most people. In the question“What are the best 2D animation tools for Unity?” Creature is ranked 5th while GAF:Flash to Unity is ranked 9th. The most important reason people chose Creature is:
One of Creature's strengths is its ability to assign motors on bones which will generate animations based on parameters set on the motors.
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Pros
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.
Pro Automated animation
One of Creature's strengths is its ability to assign motors on bones which will generate animations based on parameters set on the motors.
Pro Unity runtime always up to date
Among various game engine supported, Unity is the most up to date runtime including the most recent features, many samples, integrating well in the Unity editor.
Pro Easy to use
Creature has a simple workflow structured into 3 steps: Meshing, Rig and Animate.
Cons
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.
