Three Ways To Be a Saber-Toothed Cat

@article{Martin2000ThreeWT,
  title={Three Ways To Be a Saber-Toothed Cat},
  author={L. D. Martin and J. P. Babiarz and Virginia Naples and Jonena M. Hearst},
  journal={Naturwissenschaften},
  year={2000},
  volume={87},
  pages={41-44}
}
Abstract Saber-toothed carnivores, until now, have been divided into two groups: scimitar-toothed cats with shorter, coarsely serrated canines coupled with long legs for fast running, and dirk-toothed cats with more elongate, finely serrated canines coupled to short legs built for power rather than speed. In the Pleistocene of North America, as in Europe, the scimitar-cat was Homotherium; the North American dirk-tooth was Smilodon. We now describe a new sabercat from the Early Pleistocene of… 
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References

Functional Morphology and the Evolution of Cats
TLDR
Three basic morpho types are proposed for cats on the basis of their upper canines: conical-toothed cats with short, unserrated canines having a round cross-section; scimitar-tooting cats having short, broad canines; and dirk­ toothed cats having long, slender canines which usually have fine serrations.