I have narrowed down my servo choice to one of 3 options. This is going into a touring car.
I really can't decide between the low profile KO or the standard BSx with faster speed.

KO RSx one 10
KO BSx standard
Futaba bls255HV

Or any other high end servo options that I might have missed.

Any other ideas are appreciated.

I just got the RSX one 10 and love it. Its not in my TC yet as we just finished our onroad up for the year. But it will be my servo of choice next winter for sure. I used a BLS551 this last winter and it was plenty fast as well.

For me personally, a shorty is a must in a TC. Space is always at a premium. And its better to have extra space to be able to move things around if needed.

Agreed you will def want a low profile servo for touring car.

I have a RSX one 10 and really like it. Butter smooth and KO customer service is top notch