I like the smell of Souveran, Crystal Mist, NXT Car Wash, Sonus Acrylic QD, Meg's Quik Detailer.
While not really offensive, the Klasse twins, Klasse VLRP, Vinylex and 303 aren't too appealing to the olfactory nerves.
That said, smell does not weigh in much in my choice of favorite products. How a product looks on a car does.