What do indie devs prefer to use for creating 3D models and textures? Blender or FBX?

I'm learning about game development starting with modeling. I've been using free assets on TurboSquid and I'm not sure which type of models to use... Blender or FBX. The prices are cheap but I'm not sure as to the quality. I'd like to make a small full game, that I would release, using these assets. This is all very intimidating.