Whoops, I like more than half the existing types. (Fire, Water, Flying, Psychic, Ice, Dragon, Dark, Fairy, Ghost, and Steel.) However, if I have to go with one type, it'd have to be Steel. Although I tend to follow an "offense is the best defense" strategy when playing Pokemon, I really enjoy the number of resistances Steel types have. Many can take quite a few hits before falling, but there are still plenty of offensive ones that can hit hard and give people trouble. Furthermore, I like most of the Steel type Pokemon and have used/plan to use a majority.