Ureshon!

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These are both fetish manga that involve piss. Specifically, Omujo involves wetting diapers. Overall, I would say Omujo to be the more enjoyable one out of the two. It's also far less intense with the fetish bits. If you don't want to look at seven panels of piss in a row, read it instead. 

Girigiri Out is not a fetish manga or even a particularly sexual one as this one is, but they both involve piss in a central role. They're both enjoyable even without a fetish, though. Girigiri Out is a more traditional romance whereas in Ureshon the protagonist is already popular and dating a childhood friend; therefore, if I had to choose one, the former is better. 

Both manga have perverted alpha males.