Opera offers better privacy than Chrome with built-in VPN and trackers blocking, but for true anonymity, Tor is still the best choice.
Yes obviously none of the browsers support true anonymity. In fact, Tor doesn't support true anonymity by default. It's the onion protocol that offers anonymity and Tor is the medium to connect to it. I like Tor, but the speed is certainly a negative factor. You gain anonymity and you lose convencience, that's how it goes.