sr16ve is far superior. I would recommend running 27lbs with no intercooler, yielding roughly 600whp, with daily driven reliability.
the sr20ve is really a piss poor motor with many differences form the sr16ve including %75 hemispherical piston domes as compared to the sr16ve's %78.5. The sr16 is also ideally suited for high hp situations given its honda-like open deck construction, with a high resistance to cylinder wall fatigue due to mechanical force acting on it. But you will need to watch, the open deck offers very poor cooling effects.
Dudeman