All adult Tamagotchi characters are "good" because all of them are special in their own way!
But Furawatchi and Mametchi are higher-disciplined, harder Tamagotchi to get. However, they're not "better" than getting a Maskutchi or Nyorotchi. Hanatchi is actually probably harder to get than Mametchi and Furawatchi, because I believe there's a special method of getting one. On the V1, you had to have a Hinotamatchi or Ichigotchi and keep it well-fed but unhappy. I'm assuming it's different on the V2, though.