I have a Super Pista and have ridden it all over the place. It's a fun ride, and is relatively comfortable as far as aluminum track bikes go. I also added a Parallax to my collection this year and haven't ridden it much, but from the rides I have done -- I enjoy it as much or slightly more than the Super Pista (this could just be because it's a new bike/build). The feel similar to ride, however. Also of note on the parallax: Toe overlap.
Being taller, I don't have the toe overlap issue that people talk about with the Parallax. I recall [MENTION=164476]Scrodzilla[/MENTION] talking about the smaller frame sets having some crazy overlap issues, like crank interference with the tire.