Superman is generally considered stronger. He has greater experience and his powers seem to have reached a higher level of potency. However, it can vary depending on the specific comic storyline and interpretation.
The 'Red Daughter of Krypton' storyline is quite popular. In this, Supergirl has to face a clone of herself created by Lex Luthor. It's a complex story that delves into Supergirl's identity and her place in the world. She has to battle her clone while also dealing with the moral implications of being a Kryptonian on Earth.
Well, you might find suits like the one with a golden trim for special powers, or a darker, more edgy look for when she's facing intense challenges. The range is wide and it all depends on the creative direction of the comic book writers and artists at the time.
It depends on the specific comic book series and the context. Generally, Superman is often shown to have greater strength, but there have been alternate storylines where Supergirl might have displayed comparable or even greater power in certain situations.
Supergirl is a popular character in fanfiction. Writers love to explore her powers, her dual identity, and her relationships. Her superhuman abilities make for exciting action scenes, and her kind heart makes her a beloved hero in many stories.