When comparing GAF:Flash to Unity vs 2D Toolkit, the Slant community recommends 2D Toolkit for most people. In the question“What are the best 2D animation tools for Unity?” 2D Toolkit is ranked 3rd while GAF:Flash to Unity is ranked 9th. The most important reason people chose 2D Toolkit is:
The documentation for the toolkit is well written and there are video tutorials as well as an active community.
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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 Good documentation
The documentation for the toolkit is well written and there are video tutorials as well as an active community.
Pro Includes source code
No need to pay more to get access to the source code.
Pro Pixel-perfect camera
Pixel games in the style of 8 or 16 bit systems need to have each pixel uniform on the screen which 2D Toolkit supports with a camera component.
Pro Add colliders in the atlas editor
Choose from either a box, sphere, or mesh collider that will output as either a 3D or 2D collider in Unity.
Pro Create different resolutions of atlas
2D Toolkit allows for different sizes of atlas from 1x, 2x, or 4x which can be changed depending on platform resolution.

Pro Built to work inside Unity
2D Toolkit is an editor extension so users don’t have to leave the Unity engine for tile mapping.

Pro Create Atlases within the tool
Create sprite sheets for tiles to save draw calls and to keep tilesets organized.

Pro Supports the Tiled TMX Format
Create tilemaps in Tiled and implement with 2D Toolkit.
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.

Con Doesn't integrate with Unity's Sprite system
2D Toolkit provides a completely proprietary sprite implementation. Though it can be used alongside Unity's 2D systems, the two are completely separate and require different code to utilize.
