There are a few different types of force feedback commonly found in racing wheels: gear-driven, belt-driven, and direct drive. By far the most accurate and powerful is direct drive, but these also come with a high associated cost.
Direct drive is the best for because it's relatively simple. Every force feedback racing wheel uses a motor to generate resistance and feedback through the wheel, and in a direct drive system the wheel is directly mounted to this motor for maximum response.
Don't rule out gear-driven or belt-driven designs, though. Belt-driven is an exceptional force feedback system that uses a belt to connect the motor to the wheel. That setup offers excellent response with little compromise.
Gear-driven systems are the most popular for cheaper racing wheels, and there's a lot of variance in how these can perform depending on their design. A wheel such as the Logitech G923 uses a dual-motor gear-driven system, and we've found that to be really impressive and quite powerful under hand. That said, some less well designed gear-driven PC steering wheels may leave you wanting more power and response from your drive.