I don't see many serious cars now days using NOS. Just pure, Jap style, hardcore components and engine know how. And unlike in the US, we don't have very long straight roads everywhere.
As for the Toyota motors, they are more reliable because they are a lower reving unit. Also you cannot deny it, but Toyota know how to make a reliable car. The motor is more after lower end power/torque, rather than all out power up top.