It did kinda matter in the show since Ranma was honor-bound to marry one of the Tendou sisters first. Plus outside of Akane, Ukyou was one only other girl he can stand out of his harem. Although he thinks Shampoo is cute at times, he considers her a nuisance and scary. Kodachi... Ranma thinks Kodachi is a psycho bitch.
But too bad Ranma sufficiently put Ukyou in permanent friend zone.
But I was disappointed that Ryouga and Ukyou never ended up together. Fucking OVA and movie getting my hopes up for a Ryouga/Ukyou end.