Microsoft Excel and Google Sheets are general-purpose powerful tools that can be used for many things, not just processing CSVs.
However, when working narrowly with a set of CSVs, a more specific tool like Superintendent is much easier to use, especially if you are already familiar with SQL.
Writing an SQL is more straightforward than setting formula for multiple cells in Excel. Additionally, a SQL is easier saved and reused for your next task.
If you are working with a moderately big CSV, one of the major pain points is Excel and Google Sheets imposes the limit of rows and columns.
Superintendent doesn't impose any limit. As long as you have available spaces on your hard disk, you should be able to work with a very large CSV.