For Lyra/Kotone, I would choose the standard one even when given a choice, because the Pokeathlon one makes her look diffferent and they aren't that appealing, except the top.
No hat makes her look really different.
For Ethan/Hibiki, I would still choose the standard one, but I would like to switch to the Pokeathlon one sometimes too.
The reason is that Ethan/Hibiki also looks pretty different in the Pokethlon one, and the standard has a place in my hearts.
And most importantly, I only like the top half, since the pants feel like they are annoying to wear and annoyingly short to look at.
But I must admit, the Pokethlon one is really cool looking, though again, it makes him look totally different.