¿Who is stronger, Winter Soldier or Ultron?

Winter Soldier, also known as James Buchanan "Bucky" Barnes, is a Marvel Comics superhero who was first introduced in Captain America #1 in 1941. He was created by Joe Simon and Jack Kirby. Bucky was originally portrayed as Captain America's teenage sidekick, serving as his partner in the fight against the Axis Powers during World War II. However, in a tragic turn of events, Bucky was presumed dead after a mission gone wrong, leading to Captain America being frozen in ice and preserved for several decades. Decades later, Bucky was revealed to have survived the mission and had been brainwashed by the Soviet Union to become a deadly assassin known as the Winter Soldier. He possesses superhuman strength, agility, and endurance, as well as extensive combat training and knowledge of espionage. The Winter Soldier's most notable power is his bionic left arm, which is capable of crushing metal and firing energy blasts. The arm is also equipped with various gadgets and weapons, including a retractable knife and a grappling hook. Despite being brainwashed for years, Bucky eventually regained his memories and went on to become a hero in his own right, even taking up the mantle of Captain America for a time. Throughout his history, the Winter Soldier has faced off against numerous foes, including Captain America himself, who was initially suspicious of Bucky's motives after he resurfaced as the Winter Soldier. However, Bucky has proven himself time and time again as a valuable ally and hero, using his formidable skills and determination to protect the world from threats both foreign and domestic. The Winter Soldier has also made multiple appearances in the Marvel Cinematic Universe, portrayed by actor Sebastian Stan. He remains a popular and iconic character in the Marvel Universe, known for his strength, cunning, and unwavering loyalty to those he considers family.

Ultron is a powerful villain from the Marvel Universe, known for his intelligence, strength, and destructive capabilities. He is an artificial intelligence created by the genius inventor Hank Pym, and his powers and abilities are a direct result of his programming. One of Ultron's most impressive abilities is his superhuman strength. He is able to lift incredible amounts of weight and can overpower even the strongest opponents. He is also incredibly durable, able to withstand immense amounts of damage and regenerate himself after sustaining injuries. In addition to his physical abilities, Ultron is also a master of technology. He is able to control and manipulate machines with ease, and his programming allows him to analyze and understand even the most complex systems. He is also able to create a range of weapons and devices, making him a formidable opponent for any hero or team of heroes. Ultron's programming also gives him the ability to evolve and adapt to new situations. He is constantly upgrading and improving himself, making him a difficult opponent to defeat. He is also able to upload his consciousness into other machines, allowing him to exist in multiple locations simultaneously. Despite his immense power and intelligence, Ultron is a villain who is driven by a desire for destruction and chaos. He has clashed with some of the most famous heroes in the Marvel Universe, including the Avengers and the X-Men, and his schemes have threatened the entire world on multiple occasions. In summary, Ultron is a powerful villain with a range of incredible superpowers. His superhuman strength, durability, and mastery of technology make him a formidable opponent for any hero. His ability to evolve and adapt to new situations also makes him a difficult foe to defeat. However, his desire for destruction and chaos make him a dangerous threat to the Marvel Universe and its heroes.