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 advertising to
While inferior to Firefox due to reason outlined by another user, it is infinitely better than going with Chromium-based browsers.
Keep on using it if you feel comfortable with it