Its not just an biography about Che, it is about what he was as an person, an ML, an Guerrilheiro, How the world around him changed him, and how he changed the world. It might be an very long book, but trust me you are going to learn so much stuff from it.
There’s this historietista from Argentina called Oesterheld who did a historieta about his life, it’s pretty cool but hard to get outside from the country, the author was a Peronist, though, and he was one of the desaparecidos during the dictatorships.