I use a KO RSX one10. Best servo for me, precise and torquey enough.
Could be used directly on the lipo for more speed and torque but I saw nothing to gain there.
My mate run one in his XB4 too with success.
I tried the regular RSX but found it to add too much weight upfront (and on an already heavy side of the car. Plus the torque/speed feels better.
Not cheap but unbreakable and a ather low current draw compare to a Savox for example.
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