The difference is that Microsoft doesn’t just give you Edge as the default, they actively try to get you to switch to Edge if you’re using something else, with

The difference is that Microsoft doesn’t just give you Edge as the default, they actively try to get you to switch to Edge if you’re using something else, with random notifications, pop-ups in Settings, making it harder to switch to other browsers, making browser links opened by the OS (i.e. search bar, help) open in Edge, etc…