Bihada Ichizoku

In these anime the two main female characters are competing with each other. In Peach Girl, we have frenemies Momo and Sae competing for love, and in Bihada Ichizoku we have twin sisters Sara and Saki competing for beauty. The art styles are similar. Both anime convey views on what, in their opinion, makes a woman beautiful. They both reminded me of soap operas with all of the drama that takes place. If you liked one, you'll more than likely enjoy the other.  

Similar visual style and unpredictable plot twists. 

Both animes use real people in the shows  

Both anime are satires about how only a select few women could ever look beautiful. The shorter series is pure satire while Kuragehime weaves a tale around a girl who meets a young man who believes every girl can be a princess. 

Genre surprise! Expect the unexpected! Samus is a girl! Both show feature these quality, like ending of megatron, or was it megatorus? Either way, both show leave you guessing what happen next and you just can't get it right. Moreover, they feature strong genre conflict to the point that two Einstein can coexist at the same time. You just can understand what the hell it is about, but you will never pinpoint the genre. Solution: just tag it multi-genre and leave it at that.