What is the difference between modifiers and variants?

[Sam2019]

I was wondering what is the difference between variants and modifiers, they both look so similar 

[Fanny]

They are different in several points:

- With variants you can track the stock of each variant, but with modifiers it is not possible to do that

- Modifiers have a "sales by modifier" report, while variants do not have such a report and are only reflected in the sales by item report

- Modifiers are easy to apply on several items with one tap, but variants needs to be created for each item separately

- Variants can have their own SKU and barcode, modifier don't have such an option

- Modifiers can have a negative price (value) but it is not possible to have a variant with a negative price

- In the sales screen in the POS, you can choose several modifiers for the item but with variants you can only choose one

Basically if you are selling the same item but with different versions then variants would be best, if you are selling items with additional options (e.g toppings) then you can use modifiers