Every type has their advantages and disadvantages. For example, Mega Horn is the only good bug-type attack (other than fury cutter after a while) and only Heracross can use it. I don't have one favorite type, but I do prefer some over others. Psychic over Ghost, Rock over Steel, Water over Ice, Normal over Fighting, and Grass over Bug, just to name some similar types.
When women tell you to get into shape, tell them round is a shape.