They're both built from the open-source Chromium browser, so content will be rendered in the same way. Other than that, the features between Windows and macOS should be exactly the same. Microsoft also noted that PlayReady content decryption is only supported on Windows 10, which means no 4K Netflix streaming on macOS. Naturally, there are some features that are not coming to macOS, such as IE Mode. The options on the Touch Bar will include things like website shortcuts, tab switching, and media controls. The firm also said that it's adding some features that are exclusive to the OS, such as Touch Bar support. Microsoft said it made some tweaks with different fonts, menus, keyboard shortcuts, title casing, and 'other areas', which are meant to match the style of macOS. In terms of differences from the browser on Windows 10, they're subtle. At this time, it's only available from the Canary branch, which gets daily updates.
First announced in December and shown off at Microsoft's Build 2019 developer conference a couple of weeks ago, its Chromium-powered Edge browser for macOS is now available to download.