IMHO, based on temperament and barring some health issues that go along with different breeds, my list would include well bred members of the companion breeds.
Bichon, Papillion, Cavalier King Charles Spaniel, French Bulldog, Keeshond, Pomeranian, Boston Terrier.
Or the used to be working breeds that are now mostly watered down versions of the breed (not to say that there aren't still working dogs of these breeds, but they are rare).
Saint Bernard Dog, Mastiff breeds, Greater Swiss / Bernese / Entlebucher Mountain Dogs, Great Dane, Newfoundland, Great Pyrenees.
For the worst possible breeds chosen for inexperienced dog owners I would choose members of the Livestock Guarding Dog and Molosser groups.
Ovcharka, Presa Canario, Cane Corso, Fila Brasileiro, Dogo Argentino, Boerboel, Kuvasz.