One thing I'm liking about #Vivaldi is that frequently, though not always, when I say to myself, "Hmm, I wish <x> worked like <y> in Vivaldi instead of the way it does," and then I go look in Vivaldi's settings, it turns out that there's a setting to enable the behavior that I want.
Example: I like the browser settings to open in a tab, not in a separate window. It turns out separate window is the default in Vivaldi, but by toggling one checkbox I make them open in a tab. Nice.