They don't serve the same purpose. Pyinstaller builds bundle the python binary with the project. It works without a Python installed on the system, is not port

They don't serve the same purpose. Pyinstaller builds bundle the python binary with the project. It works without a Python installed on the system, is not portable and the resulting binary is fat. It also can fail in numerous way and be slow, but end users will find it the easier to use when they work. Pyz files just contains python code. Shiv produce them by bundling your code and the dependencies, but you still need a Python installed on the system to run that. You pay the cost of zipping only on the first run though, after that, it's unzipped. And their are portable if you use no binary wheel. It's light and easy to get right. In that sense, they look more like War files in Java. Pyinstaller, like cx_freeze and nuikta are for end users. Pyz are for devs.