Spencer has a valid point, the same setup doesn't always suit two drivers.
Me and Jimmy are fairly evenly matched most days, but I think his car is really "wish washy" and doesn't easily go where its pointed. On the flip side Jimmy usually hates my car saying its got way too much steering.
basically what I'm saying is try the car, if it feels OK stick with it, if its not to your liking come and ask someone for advice