Both titles are treat for a butler-themed romance fans. In Mei-chan no Shitsuji there's theme of rivalry with other girls, but the drama is still very very cute!
In W Shitsuji butlers are ordinary boys, while in Kuroshitsuji there's demon butler. But! Also in Kuroshitsuji there are some fanservices, even if it's from 3rd person pov. Both are eye-candies for butler freaks! lol
