Raptor 50, S9001 or S3151???

[lbz34]

I have two helis here. I have one sold this weekend. The raptor has 3 S9001 on the head and one S3151 on the throttle. The Hirobo (which is just about sold) has all S3151 on the head. Which servo is better for the raptor 50?

S3151
or
S9001?


Thanks

Sean