{Fight, Rock, Flying} is the only set I can see that is the same ratio of effectiveness as the traditional set without a water, fire, or grass type in the set.
{Poison, Grass, Ground} and {Fire, Steel, Rock} are the other two sets that have the same ratio as the traditional set.
Other sets have an immunity or is neutral to one or more types in the set.
Edit: If you feel like doing more research into type matchups, a handy chart can be found here: Serebii.net Games - Type MatchUp
I would have to choose Dark, Psychic, and Fighting types. There are so perfect in unison, just like the way how the starters are right now. I would definitely choose the Dark type starter. I love Dark types! <3