which if either is better for my 07 AM V8Vantage

I am not really too concerned about clutch feel, I will learn to deal with, more so interested in the better throttle response and added longevity(this is primary as I plan to drive this car not make it a garage queen). I know you sell these but is that AM tool required for install or will a mechanic have a similar tool, or does the tool come with the kit as well as an install guide?

So how does RSC compare to stock, if anyone knows?
Does RSC or VelocityAP change at which point it gets engaged? I drove two Vantages and both engage almost at the very end of pedal travel. Is that normal or by design?

Looking for info as i'm interested in purchasing a V8V manual.

Thanks much