One feautre I did not know I was missing (coming from Chrome) is the smooth scrolling in the new dev build!
Since the first dev build, I've used Edge insider for all browsing besides PDF viewing, which I used Edge Classic. When this new build came out, I was exicted, due the PDF experience should've got better.
The PDF experience, in my opinion, is a little worse than Classic Edge (but better than Chrome), due the lack of:
Smooth scrolling (found in Classic Edge).
The PDF's can not be written on with a pen (Surface Pro 5 user).
I think this new Edge will get popular. It's great!