- Great white (no question)
- Whale shark (controversial, but extremely impressive in person due to their size)
- Tiger shark (your archetypal mean aggressive dangerous shark)
- Hammerhead
- Those ones that look like they have hedge trimmers for noses
Whale shark to me has been the big climber (although I may be biased because I lived in atlanta and saw constant ads for the atl aquarium) along with the revelation that tiger sharks are actually the most dangerous to humans.