RE: dual servo's ???
The 5745 would turn the wheels better than the GWS both in speed and in torque. I assume you have the plain old S666, and if so, the 5745 has 25% more torque, and the transit speed is 0.08sec faster.
As for digital vs analogue, digitals can be programmed through the radio, that is if the radio has the features to program them. So, digitals offer programming in EPA mid points, fine trimming, exponential steering curve, fine dual rate, and failsafe setting inside the servo itself instead of taking failsafe instruction from a failsafe unit or from an RX with failsafe built-in. Additionally, they work to keep the servo horn where they are supposed to be at all times, even expending energy to hold harder. But that extra energy expnediture has a benefit: at the instant you hit the trigger or turn the wheel, the servo gets a jolt of juice to more instantaneously apply its max starting torque, 10x faster than what an analogue servo would do.
Typically, digital servos are capable of receiving and performing 10x faster than analogue, but that performance increase is ususally very small to see due to human reaction times are not that good as compared how fast digital servos can respond to input signals. The ohnly time you can noticabley feel that 10x faster response is at the instant you pull the trigger or turn the wheel (when starting torque is more instantaneously applied as compared to non-digital servos).