What is a sbus servo ?
 

https://www.futabarc.com/sbus/index.html

Would benefit airplane applications, not to much for surface applications tho. Another thing about sbus is the ability to program your servos like Sanwa SSL, and/or utilize Futaba's Super Response (SR) system

Just means that the servo has the ability to communicate with serial data instead of a standard PWM signal (usually they can use both). This is more of a commercial (non hobby) type of thing, I don't personally know of anyone using S.Bus in any of their airplanes, at least not how it's advertised.