It depends on the film.There are films like the epic অথবা ফ্যান্টাসি ones in which the beautiful colours are needed.But there are also the film noirs and the romantic চলচ্চিত্র in which black and white give a unique charm and mystery.
That depends on the movie. I don't really like modern চলচ্চিত্র which are in black and white but I প্রণয় to watch old চলচ্চিত্র which are in black and white.