Peloton is a brand of bicycle and online training platform. The equipment is of high quality, and many users report that it seems to be built very well.
Zwift is an app that works with “smart trainers” or bicycle trainers that can connect over Bluetooth to a computer or phone. You can pick a gear to match your needs and budget.
Because Zwift allows you to use your own hardware, the costs can vary dramatically. However, most users have fairly typical setups.
The Peloton bike is built well and built to last by most accounts. The bike itself comes with a display to run the Peloton app and experience.
So there is not actually such a thing as a “Zwift bike.” Instead, you use your own bike, which can be a great advantage for Zwift.