The whole point of the Ralts evolution line is to represent a white knight. Gardevoir represents a courteous servant while Gallade is some sort of personal guard. A lot of people like Gardevoir, but almost everybody seems to hate Gallade.
Gardevoir as an almost human female-lots of attention
Lucario as a humanoid male-lots of attention, probably even more than Gardevoir. Art of Lucario has about three times as many pages than Gardevoir has.
Gallade as a male human-like Pokemon-almost a nonexistent fandom
Just once I'd like to have a conversation about furries that doesn't turn into a flame war, joke thread, or NSFW images.