Adobe Photoshop is clearly the flagship of all photo editing programs. It is chosen all around the world for its capabilities and ways to create exactly what you want to.
Photoshop is clearly a leader due to the amount of built in effects that you can easily apply and tweak to put on a photo. You can also create your own drawing from sketch and use photoshop as a virtual canvas. This is possible due to the varying type of brushes and if you use a graphics tablet you can apply different pressures to blend as you would in real life. You can also use these brushes on real photos to airbrush or touch up them.
In all Photoshop is a difficult program to learn but once you have mastered some of the basics you can edit your photos in amazing ways and create masterpieces. A must for anyone interested in photography or art. 10/10