leatherette seat covers -- imo, parang trying hard [na maging genuine leather] yung dating. it's hot, it would make you sweaty, some are obviously fake leather... though some are better than others

stock seat covers -- well, definitely hindi maporma, a bit tacky looking even... and if they're white as they usually are, they easily get dirty

w/o seat covers -- this would be my choice (my first choice is genuine leather upholstery), unless you're travelling with a dog or a kid (or some other mess-prone passenger)