[mothered]

Photoshop is great for editing pictures or raster-based stuff. Illustrator is better for logos or vector-based stuff. Our header BGs were edited in Photoshop, but our logo was made in Illustrator.

Finally, the answer I longed-for. Even my work couldn't provide a definitive reply.

Now It makes sense why my work uses Illustrator. They design logos for the fashion Industry.
Thanks for clarifying It.