ptitseb's 3D ports like Jedi Knight 2, etc... come to mind. Hopefully we'll get some of those for the Pyra as well.I don't think emulated vs native would be fair to the machine emulating. I think a software title that has a native binary for both architectures, and also wasn't some cherry picked application that had optimized performance for one and not the other.
Try to find an intensive app that is both arm and x86, Windows and Linux.