It's just better made all around. The site is sleek. The game renders well, doesn't lag at all even on very old and underpowered devices. The analysis on liches

It's just better made all around. The site is sleek. The game renders well, doesn't lag at all even on very old and underpowered devices. The analysis on lichess with wasm stockfish was stolen by chess.com -- there are no premium features and no ads. There is simply no good reason to use any other site.