I don't think needs to be said again and again, but for the people in the back: Fuwawa is the superior sister.
She is,
>Funnier
>Bouncier
>More compassionate
>More mature
>More courageous (in horror games)
>Less greedy
>The dominant talking role in any conversation
>Better at Japanese
>Can actually stream solo without becoming an awkward sperg
>Has a higher vocal range
Watch their latest FuwaMoco Morning. Mococo is like a side character to her blue sister.