Instead of keeping tabs open or needing an extra plugin/service Vivaldi has a "reading list" option I can use that saves links for me to read later without any third party service like pocket.
There is a completely customizable sidebar, a few of the defaults its has are quick notes and translations, but you can also add any web page.
And overall its just had a general trend of actually quality new features, even ones i don't use i still think are neat.