True, however this shouldn't be about preferences per se, it should be about what Pokémon looks like they fit better.
A 'bit' of an exaggerated example, but what do you think is more realistic as a Pokémon with let's say Normal/Flying typing with the ability Intimidate with base stats of 80 HP / 120 Atk / 60 Def / 60 Sp. Atk / 60 Sp. Def / 130 Spd: a cute, innocent looking Snail Pokémon with small wings that looks fairly bulky but also looks pathetically slow and only averagely powerful, or a generic bird (touched up to be at least only about 40% generic) that looks fairly intimidating, strong and swift, but also frail? Sure the snail may overall look a bit 'cooler' than the bird in the majority's eyes, but at the same time it looks like anything but intimidating, strong, fast and frail, which logically should make it an easy victory for the bird.
For the sake of example let's say that while the majority thought the snail was more badass than the bird, they also recognized that it just doesn't play the part of the designed Pokémon, and so ultimately they opted for the still fairly cool bird Pokémon (it must be at the very least decent otherwise it wouldn't have made it to the end.) This should work in a similar manner (that being said obviously everybody has their own views on what looks like it fits everything better, and the Voodoom/Kukem's Pokémon 'showdown' isn't open-and-shut like my example, but your vote for should be based on which of them looks like it fits better, not who looks cooler.)