What browser do you use now? I agree with your points, but I've stuck with Chrome because of the range of extensions.
Vivaldi has a cool story, former Opera guys that want to make a browser for the power user, not your mom- which is basically the only browser that actually targets me as it's intended audience. The downsides are it's only in technical preview mode and they pretty openly admit to tracking your usage [at least their openly admitting it, everyone else does the same expect maybe Old Man Firefox]