What format should I choose? [closed]

I am making models in blender to export them then in unity, and unity can import .blend formats as well as .fbx, so which one is better, is there even any difference.

• Is there any loss of quality when you convert from blend to fbx format? (Is this like converting from a multi-layered PSD to a png?) – ashes999 Aug 22 '15 at 18:50