Yes, there are some advantages of jaggery but if one learns about the immense disadvantages & toxicity of sugar, any substitute will be good to switch to. Please do write a post on all the disadvantages of sugar, some day 😊.

A tip for those who want to substitute sugar with jaggery:
Take a measured weight of jaggery and water. Boil it to make a syrup concentrate according to the sweetness you like. Store it in a glass jar / bottle and keep it in refrigerator. This syrup will be easy to and of consistent sweetness to mix wherever you mix sugar with. This syrup won't spoil for a week or two.
RIP sugar!