glTF is Khronos' open standard for web 3D and AR/VR, FBX is Autodesk's proprietary format for games and animation. glTF is the 'JPEG of 3D', FBX is the industry standard.
| Criteria | glTF | FBX |
|---|---|---|
| Web (Three.js) | ✓ | ✗ |
| Game engines | ✓ | ✓ |
| Animation | ✓ | ✓ |
| Open standard | ✓ | ✗ |
| File size | Compact (GLB) | Large |
For web 3D, Three.js, AR/VR, Cesium, compact transfer.
For Unity/Unreal, Maya/3ds Max, professional animation.