How Do I Choose Between Waterfall or Agile?

The first step is to know and understand what Agile Frameworks exist and how they are similar or different from each other.

Next you identify and understand what makes a project Agile.

Once you know what makes a project Agile, then you can dive deeper into each Agile framework before you choose.

After you understand the frameworks, you can compare to the flow of traditional waterfall processes.

Make a decision based on organizational culture, the type of work you are doing, and what fits best!