I have run Savox in the past with good luck well except a had one that would not work out of the box. I have run Futaba and Hitec with good luck as well, but for me, I am just comfortable flying JR servos and that has to count for something. I have JR servos that are 15 years old and they work perfect.
I'm not saying other servos are bad, I just prefer JR.
I