¿Who is stronger, Groot or Fallen One?

Groot is a character in the Marvel Cinematic Universe (MFCU) who is also part of the Guardians of the Galaxy. Groot is an extraterrestrial being who belongs to the Flora colossus species, a race of arboreal humanoids capable of regenerating and controlling their own plant bodies. In the UCM films, Groot is portrayed as loyal and brave, yet innocent and sometimes childlike in nature. Groot has a very distinctive personality and his vocabulary is limited to the phrase "I am Groot", although other characters seem to be able to understand his meaning based on context and intonation. Groot possesses superhuman strength and stamina thanks to his wooden body, as well as the ability to regenerate and grow his limbs at will. He can also throw sharp spines and control the vegetation around him. Throughout the UCM films, Groot plays an important role in the fight against the forces of evil, even sacrificing himself to save his friends on one occasion. After his sacrifice, a new Groot is born from a branch, meaning the character is essentially immortal.

The Fallen One is a powerful and mysterious cosmic entity from the Marvel Comics universe. It is an ancient being of immense power and possesses a wide range of superhuman abilities, including super strength, super speed, energy projection, and the ability to manipulate reality. The origins and true nature of the Fallen One are shrouded in mystery, and little is known about its past or motivations. It is believed to be one of the oldest known entities in the universe, and has been worshipped by many civilizations throughout history as a deity. Despite its god-like powers, the Fallen One has often clashed with the superhero team the Fantastic Four and other cosmic entities in its quest for power and domination. It is a formidable and dangerous foe, and has proven to be a constant threat to the safety of the universe.