Let's see...
Faster
Uses far less memory with all the same tabs and extensions enabled (around 1/3 the total Chrome uses)
They stripped out all of Google's tracking services, using strictly the rendering engine
To that previous point, there's far more Privacy settings that are very easy to find, like Brave, to give more granular control
Has PlayReady DRM in addition to WideVine, so you can use it for more media sites
Tracking Prevention (like Safari) by default
And for those in an older Enterprise Corpo world... IE mode