They have a lot in common, but for Daz Studio, you basically take ready-made assets and combine and modify and arrange them to create images / animations. It's a playset with an infinite variety of toys.

Blender is the factory where the toys are made from scratch in a variety of ways.

I have no plans to use Blender seriously for the foreseeable future; my priority is improving my skills in Daz Studio first. But it was nice to understand how Blender works and many of its functions, and add another potential toolkit to my repertoire.