I think a lot of people are forgetting about theost important part of this debate, individual mutations/differences. we know that a certain species of pokemon can look very different, magikarp is the best example, it can be pink, spotted, striped and many other things, when it comes down to seaking you'd have to be an absolute retard to not appreciate the variety of different horns on individuals, there could be twisted horns like a unicorn, a antler-esque horn, multiple horns on one seaking and so much more. when it comes down to fins you only have size and maybe patterns, and only nerds wanna count how many spots are on a fin. horns are objectively better and you can't prove me wrong.