Hello, I am new here and just found this forum. I have been testing out multiple web browsers, and I really like Vivaldi, and Otter, but I never actually tried Opera itself. I seem to have missed it before it switched over to the Blink engine. How does it compare to Vivaldi?

I like FOSS, but I can live with Vivaldi being partially open-source (I think it's only the UI that is proprietary.) Despite this, I'm quite impressed with Vivaldi's performance, and it makes me want to go give Opera a try. What are the differences between it and Vivaldi?