From the docs:

> Wails uses a purpose built library for handling native elements such as Window, Menus, Dialogs, etc, so you can build good-looking, feature rich desktop applications.

> It does not embed a browser, so it delivers a small runtime. Instead, it reuses the native rendering engine for the platform. On Windows, this is the new Microsoft Webview2 library, built on Chromium.

So it should use the OS webview.

A web stack can be a complex payload for an app and have a wider attack surface, however it speeds up the UI development a lot. Of course you alredy know that :)