In every Zoids anime (and many video games) that I've seen, the main character always has a liger as his main zoid. While I have nothing against ligers, I find it unfair to the hundreds of other zoids that don't get enough time in the spotlight.
I woould personally enjoy reading a story where the main character (not an antagonist) pilot a Gairyuki.
If anyone can come up with a story that has some other type of zoid as its main focus, I am all ears.