No competition that I know of. Use the right tools for the job. Start your learning with the Classroom in a Book series from Amazon.com -- available in paperback or Kindle e-book.
Photoshop is a raster image editor. Great for pixel-based, resolution dependant photos & images.
Illustrator is a vector graphics editor. Great for math-based, resolution independant images that can be scaled up or down to any size that's needed without quality loss. That's something you can't do with raster images.
Source: https://en.wikipedia.org/wiki/Scalable_Vector_Graphics
Nancy O'Shea— Product User, Community Expert & Moderator
Alt-Web Design & Publishing ~ Web : Print : Graphics : Media