Having owned an F355 and driven some Porsches in my time I can tell you they're totally different beasts.
Both have great levels of performance but to me the Ferrais are works of art and I could generally chose them over the rather more utilitarian designs of Porsche.
I did own a Boxster for a while and that was fun but now I have kids now so the bigger Porsche becomes more practical and when all is said and done unless you have two or three cars the Ferrari is just too impractical, I sold mine two years ago :
