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Chopper's story is better than Sanji's.
Sanji's family was the owner of a military powerhouse,whose moral is that power is all that matters in life. They build their power of a extremely artificial way, and Sanji was a different part of it. He is a human and enjoy human things in life,and suffered much for this. Despite being freed of his family and trained, he never managed in became a powerhouse and better than them.
The villains of Sanji's introduction arc were a pirate crew which was only powerful for East Blue's standarts. They didn't grew up after their defeat like Enel and CP9 did and may never have participations in main storyline again.
Sanji's foster family is only a petty pirate captain who had to give up of his pirate life for Sanji's sake.
Chopper's birthplace is a island-sized version of the whole world. A place where the good fight the evil. It was ruled by a king who didn't cared about the people. Before Chopper's foster father died, he leaved a thing that would save Drum Island in future. Chopper also got powerful after that and participated of the king's defeat.
The villain of Chopper's introduction arc is comical,and yet skilled. His story continued after his defeat and he still relevant in storyline currently.
Chopper's foster family is a female doctor,that despite being a peaceful citizen, is yet a fighter. Due she have a secret way to extend her lifespan, she is one of the oldest characters still alive, and with that, certainly had many connections in her past with the One Piece Universe's past,what should lead her to have big participations in the future of story.
Chopper's personality is better than Sanji's.
Chopper is a mix of both animal and human,the two most proeminent life forms existent,as character. He seeks himself, his place in world and his purpose in life as member of a adventurers team in a fantastical universe. His storylines are always the most sweet, because he is a child in heart, mind and spirit and always do things as such.
Sanji is Straw Hat Crew's cook, and is overshadowed by biggest part of One Piece's characters as pirate and fighter. His lust always lead him to be screwed up because of attractive girls.
Chopper know better about fighting than Sanji.
When was a child, Sanji was always powerless against his siblings.
When was a child,Chopper won a fight against the leader of his former flock.
In his introduction arc, Sanji was overpowered by both Krieg's two crewmates when fight them.
In his introduction arc,Chopper defeated both Wapol's two mates fused in one.
When a child, Sanji needed a strong fighter to teach him to fight.
Chopper's foster mother is a strong fighter, but Chopper not needed her to teach him. Before meet Straw Hats, Chopper used another knowledge gived by Kureha to discover the utilities of his Devil fruit, create techniques and name them. All that by himself.
Chopper's will-power is bigger than Sanji's.
Sanji already showed how weak his will- power is in his introduction arc. Witnessing the intensify of Zoro vs Mihawk, he said Zoro should have given up. A true One Piece's powerhouse character never would do it.
It was showed again in Totto Land Arc. When Big Mom Pirates threatened Straw Hats because of Sanji, he easily submitted himself to them and spent the whole arc saddened for it. Totally without the pirate spirit of fight anyone who stand in his way.
Chopper proved his will-power against one of the four Yonko. He took with his body in Monster Point a attack from Prometheus in his rampage mode, saving his crew's ship and everyone in it of be burned alive and sink in ocean as pile of burned wreckage. Prometheus is a living sun with the soul of one of the most powerful characters of One Piece's universe,making his fire deadly and troublesome for even Mihawk and the admirals. Take his attacks and survive requires not only the highest physical power,but also the highest will-power to sustain the pain and damage. Chopper proved have both,as he was able of keep Prometheus busy until the cake for Linlin arrive.
And was showed during all New World how Sanji is weak both physically and mentally, making him incapable of do what Chopper did.
Chopper is better with girls than Sanji is.
Sanji's lecherousness and sexism always scares and annoy girls he infatuate over. And is a recurring sad joke about his character that, even when he develops a bond with a girl, he is fated to never have a love story with them,as was with Viola and Pudding. And girls Sanji bond with never are great characters.
Chopper's cuteness and sweet personality always lead the most hot and cool girls to became fond with him. The main example is Robin herself. She immediately loved Chopper when joined Straw Hats and became his closest friend.
Chopper's opponents are better than Sanji's.
Gedatsu: He is a very comical and yet a stern man. After his defeat, he managed in build a new life of a both comical and efficient way. He also, totally unlike Sanji, Jabra and Absalom, has a way with woman, as was revealed in One Piece Stampede that he is in a love relationship with Baccarat, the beautiful, sexy and cool worker from Gran Tesoro,the world's biggest entertainment city.
Absalom: He was a shabby and poor people with immense lust. He tried became a lady-killer of a extremely lazy and artificial way. He wasn't a great and skilled villain in life and lose his life as a unimportant character by the hands of a superior villain team.
Kumadori: He has a theme of kabuki's character and martial arts warrior,and also has a dimension with his personal life. Unlike Jabra, he is easygoing and don't get bothered by his mates.
Jabra: He is insecure and jealous of Lucci and Kaku's superior power. He has a bad way with woman, as his girlfriend turned him down for a better man.
Chopper's Time-Skip was better than Sanji's.
Sanji spent Time-Skip in a place that is a opposite reflection of his sexism. That place only made fun of him, and so far,not showed to have improved his character.
Chopper spent Time-Skip in a place equal to himself: A mix of modern society and nature. Chopper showed in Fishman Island how he evolved his power in that place.