It's not a war, everyone has their own preferences, but for example
@ClockworkCoder expressed an opinion that I thought myself many months ago... even I criticized the inclusion of Vivaldia and I wasn't so sure that an integrated adblock was a good idea, but then turned out that they managed those things in a good way.
Also, I always try different same products for months before choosing "the only one" to use... and when Opera died I felt lost... there was absolutely no browser around comparable... maybe only Firefox with at least 24 plugins, and still felt incomplete...
So I started to follow the development of the new Opera, that is still very clean and fast, even faster for the GX version, but lacks customizations and many functionalities (that must be added with plugins)... another good project is OtterBrowser, that is made by a developer that really "knows" what was missed after the death of Opera, but it's almost a one-man work and will require a lot of time to see something "complete"... and then Vivaldi appeared... pretty much a base Chromium with a different, and little ugly for me, interface... I was unsure what to think of it... required many months to see some "basic" Opera functionalities appear, but they kept working hard on it, they started to include many customizations, and THEN I realized it was actually happening, it was really becoming different from the other browsers, like Opera was.
Vivaldi will never become like the old Opera, it's impossible, Chromium works in a different way, but they are trying really hard to make it as similar as possible, if not better in some functionalities.