Types of Motors Ferrite motors Typically used in RC cars and boats, best known as 500 motors. The magnets are ferrite and they are available in many turn and wind combinations. 
They use brushes and springs that need to be replaced as required due to wear. They most commonly use wet magnets which are magnets shaped from a slurry. These magnets are less subject to loss of magnetic fields at high temperatures then dry magnets. I typically use motors from Fantom racing, they take motors from various manufactures and fine tune them for best performance. 
Rare earth motors These motors have Magnets that are made from rare earth materials like cobalt and neodymium iron boron. These are much more powerful, more efficient and more of course much more expensive than ferrite motors. They are also more resistant to heat damage and loss of magnetic field at elevated temperate than ferrite magnets. 
Another importance difference can be seen in the below image. Notice how many comm segments there are ... Motors in this category tend to have greater than 3 poles for maximum power and efficiency. Plettenberg motors are my favorite in this category. .
Brushless motors Motors that do not use brushes and rely on specialized speed controllers to provide the current switching normally done by the commutator. 
They are more expensive but very fast. Hacker, Lehner and Aveox are the main players here. I currently only have experience with Hacker, and so far I'm quite pleased with its performance. | 
