In North America, APR is the only one I would trust at this point. There may be others with the same understanding of the ECU but IMO they have done a poor job marketing their expertise.
As far as I know, APR was the first one to figure out how to tune the ECU without having to send it in to be physically modified. They also were the first ones to post about the additional tables they found to help keep things safe and cooling in check. They also do a great job talking about how they instrument the car to verify their changes are safe. Sooner after APR came out with their tunes for the 718, another large tuner magically figured out how to program the ECU without modifications, and found these tables uncovered by APR and released version 2.0 of their tunes. The timing seemed suspect to me.
Ive mentioned it before, but wanted to be clear that I have no ties to APR, nor am I or have been a customer at this point. I may tune my 718 S in the future but it is still under warranty so not sure I want to give that up yet.... but I sure am tempted