Tricky debate going here..
A couple of tidbits that have been demonstrated time after time are that nitrous oxide has been traditionally more controllable, but this isn't so much the case today as it once was. Anti-lag capabilities in aftermarket ECM's allow for a readily available tire blowing power supply, where in the past it was difficult to spool the turbo at the line. Nitrous is STILL more controllable, but by a much thinner margin.
Nitrous is harder on internal engine components at identical levels of power. A turbo accomplishes the increase in oxygen (needed to burn more fuel to make more power) by pushing a cushion of precompressed air into the cylinders. This is a PILLOW of air and a constant source of pressure in one direction. Nitrous, on the other hand, acts like a sledgehammer to pistons by just adding a more dense oxygen supply (and fuel of course) making for a bigger boom.
People are learning, especially in the outlaw mustang arena, that nitrous CAN be less damaging than the traditional "wet" system by utilizing the fuel injectors to add fuel for better atomization. In the outlaw mustang world, nitrous still rules simply because of their use of technology. The fuel coming in through the injectors is better atomized instead of having a propensity to form droplets thus causing unpredictable lean conditions. We all know it's the lean condition that destroys motors.
In the motorcycle world, we are beginning to see the products appear that will make nitrous a competitor in streetbike shootout. It still hasn't been proven that it works the same on smaller CC motors at higher RPM, but it is in the works. I have one such friend who is using the best technology available and he is nearing a debut in Prostar with the new system.
All that being said, today, on a motorcycle, turbo is faster, more reliable, and eats fewer motors than nitrous. Let me know specifically what you disagree with and I will provide links and other resources. This happens to be something I have studied in depth over the last few years and the reason I dumped a wad of cash into my bike preparing it for racing.