Opera used to be a fantastic web browser, with a custom high-performance Presto rendering engine and features like tabbed windows that didn't show up in competing browsers until years later. However, the modern Opera browser is a shadow of its former self, reliant on chasing trends and meme advertis...
The feature I absolutely love on Opera mobile is it will dynamicly wrap text and adjust the page layout to a single column when you zoom in/out. So for pages with small text, you can zoom in to see enlarged text and just scroll down to read - where on all other browsers you have to scroll horizontally back and forth to read the enlarged text.
Opera has been doing this brilliantly for at least 10 years, and I have yet to see this on any other mobile browsers I've tried.
Firefox also has a reading mode, firefox's reading mode hides all the unnecessary element instead of zooming in though, but it does such a great job that I don't care