Favourite faction and why

I made all nine, so I'm not allowed a favourite. You are.

For some people it's a trick, like Ratmen tunnelling a Gnawhole behind your base or a Battle Priest stealing an enemy worker and building the other side's barracks. For others it's one unit. There's a dwarf called the Ironjumper whose whole job is hopping over walls, and I suspect he has fans.

Which faction do you keep going back to, and what won you over?