I want to be able to move a servo arm using a remote control. The servo needs to move up and down. You can buy rc servos which you can attach straight to a transmitter or you could wire the servo to an arduino and program the rc to respond to a controller. What method is best to use?
Thanks 
Wiring the servo to directly to an arduino is the simplest option, but it may not qualify as 'remote control' wiring the arduino to a RC transmitter and then wiring a receiver to the servo will allow it to be controlled remotely.
Are you talking about a standard RC transmitter with twin stick or a steering wheel and trigger or some other type of transmitter?
Apart from the need of a power source and a suitable transmitter you can get RC receivers quite cheap (less than the price of an Arduino)
EDIT: Or a complete system with transmitter & receiver.
Thank you everyone! 