For the price you can't beat the Savox. However, if loud servo buzzing gets to you then go with the Futaba. I had good results with my 9550 until the top case wore out allowing the gears to wobble, $10 later a new 9551 case and idler gear fixed it.
It seems that I've managed to replace all my Futaba servos with Savox in all my 1/10 off-road cars. I'm still using the Futabas in my 1/12, WGT, and 1/8 e-buggy. (TC has died in my region so the 9550/1 is sitting on a shelf in my TM-EF4.)