This comes close to my hobby science of 20 yrs+! Toilet statistics! What distribution do people follow in choosing doors? Linear (no!), Negative Binomial (I think so, but which parameters? And do the number of stalls matter?), Gaussian? Do cleaners clean all stalls proportionally? Which urinal to choose? Never pick a neighbor? Is there an optimization there? Then the economics part…
Regarding OP. Splash isn’t the only factor in urinals alas. Ease of cleaning and the ability to stop junk. I’ve seen innovative splash less designs in bars. Usually a plastic cup upside down will seriously mess up the flow. People throw paper and gum and cigarettes in them. You need it splash free And robust.
TFA does mention the fourth one is preferred in part because of cleaning. I think they wanted to show something that maximized for splash and a more realistic solution.
Regarding OP. Splash isn’t the only factor in urinals alas. Ease of cleaning and the ability to stop junk. I’ve seen innovative splash less designs in bars. Usually a plastic cup upside down will seriously mess up the flow. People throw paper and gum and cigarettes in them. You need it splash free And robust.