Well, for starters, you get hardware acceleration and device pass through. So you can use your webcam and stuff under linux and you get animations, smooth video playback, etc.
Also you can access your linux files directly from chrome os, and vice versa.
WSL2 is not even in the same league of Crostini integration though.
Also I find Windows really annoying nowadays. In desktops I much prefer to use NixOS with a minimal window manager (i3/Sway/Hyprland).