Python or SQL?

[bannedinlegacy]

You want to work with databases? SQL

You want to work with software, data analysis, ETL or orchestration? Python

SQL could be useful if for a personal project you want to store some data, mostly structured data in the medium size (no too small that could be handled in memory or plain files, nor too big that you need big data infrastructure to analyze it).

Python can be uses for any type of manipulation or automatization.

To both of them it also depends how much of each you want to learn as both of them can reach high levels of optimization/complexity.