The female one is made to be marginally cuter than her male counterpart. To a person who is either obsessed with the two or who pays much attention to detail, even differences like that can decide the option chosen. Not to mention some people will decide favouries based simply on gender.How can you use "it's cute" for the reasoning? They look almost exactly the same...
I voted for Latios simply because he's blue.
I never was a fan of the color red.
Yes, that is what I based my entire opinion on.
(Thoughtful, isn't it? xD)