[zakman440]

I'd say that all of them have something unique about them tbh. Amongst other reasons, I'd say that (I haven't seen all of it but) 1 is unique because it's the first season of the show, 2 is unique because it's the year that BBCAN went bigger and started experimenting with different twists, 3's unique because it's the first season on Global and 4's currently unique because of the international twist and the gameplay this season. BBCAN is always evolving and that's why it's currently ranked by most fans as the best version of Big Brother internationally.