They are the most reliable SC for the VQ. As to the comparison, I would not be qualified to answer that.
SC with a proper tune should put down close to 400whp, a finely tuned sr20 should put out the same, maybe slightly more.
But if you included an engine build it would be a totally different story.
IMO, tuners have yet to reach max potential from the VQ. Its still a fairly new powerplant, when compared to the SR20 or RB26.
I cant wait to see what happens in the next couple of years. (VQ tuning wise)