Originally Posted by blis

There are many, Savox, AceRC, Futaba, JR. Buy the best servo you can afford.
Buying a cheaper one first only wastes $$ because you will have to buy another.

Factors are usually:

• Motor quality
• Metal Gears
• Bearings
• Torque
• Speed
• Weight

Be sure to buy a servo horn to match and ensure the connector is wired the correct way.