Not going to get into a shouting match over browsers, lol (I'm glad you found one you like)
But isn't Vivaldi just Chrome re-skinned? I mean, I'm sure it's totally brilliant, but I personally would rather not use something derived from Chrome/Blink.
It's sort of turning into the new Internet Explorer, and I don't want to go back to those days.
I wish more browsers would use WebKit as their engine. Fast and light, and über-portable.