Which is better, Canon or Sigma, 70-200?

Canon has four fluorite lenses, and dispersion control will be better than Sigma. To tell the truth, if you ask the photographer to comment for you, you can't say too many reasons, because there is not much difference between the two. Consider how much it will cost first. Besides, if you fall down easily or suddenly get hot, don't think about Xiaobai. I have seen many white-trimmed fluorite lenses in the industry, which are brittle and expensive to maintain, and the focusing effect of repaired lenses is always worse than that of unrepaired lenses.