I could argue for hours that there is no such thing as a favourite, but if i had to choose. And id have to ignore the Ghibli films or id never pick. Not long ago Fairy Tail, but at the moment it would be.. Fullmetal Alchemist, Full Metal Panic Or even Gundam
Seed... and so many more ;s
So many to choose from, if i was a Robot you'd be picking parts out of your hair and wondering what happened.