ES Control. Make sure to read the front of the U-Can-Do manual thouroghly. My .46 UCD requires:

Ailerons: 2 Ball bearing servos with 50+oz of torque
Rudder: 1 High torque servo 90+ oz of torque
Elevator: 2 Ball bearing servos with 50+oz of torque
Throttle: 1 Standard servo

This servo set up will cost you about twice as much as the basic servo setup but is needed to prevent fluttering during manuvers.

The manual almost always tells you what size and type of servos to use at a minimum. ALWAYS read it as every plane is different.