Seto no Hanayome, Nichijou Recommendations
Both series use absurd and random jokes and humor.
There is very few things that are shown seriously (well In Nichijou there are none I suppose).
Difference: more parodies based on TV or mass-media in Seto, but in both case it simply works.
Abnormal people and creatures living ordinary lives. Absurd comedic moments. Absence of reason and normalcy. Absolute hilarity.
Well, if someone loves absurd, surreal, and random humor then watch both. Technically, every single funny moment is just impossible to comprehend using science.
Nichijou and My Bride is a mermaid both have very similar forms of comedy. Both are very over the top and enjoyable.