I was using Vivaldi when something needed to be done using Chromium. After MS updated Edge, it got an outstanding built-in text-to-speech engine, I couldn't find any more merit towards moving back to Vivaldi (since I love using that feature, it was a deal-maker).

note: I'm already using a windows machine and am not much of a privacy evangelist. But, Vivaldi is an excellent browser with a neat feature set and I totally see its appeal to power users.