I am definitely biased, being the (future) owner of a Carrera 911
One, many people can generally afford a modern Porsche. My dad and I have one of the last air-cooled Carrera's, and it is cheap to keep around. I am not on the insurance, but my dad pays around 500 American Dollars a year to insure himself on it, full coverage. Its been getting better gas mileage than his Infinity G35, and it is so docile on the road it is almost amazing to think that this luxurious feeling car is MUCH stiffer, harder-cornering and faster than his G35.
Which brings me to my point; maybe Porsche has thrived almost entirely on keeping the 911 DNA the same for so long. Sure, it gets a little boring when even a totally revised model looks more like a face-lift and little else. But they have spent so much time on this single design, you know it has to be worth something if it can last, evolutionarily speaking, so long. It is a pretty nice looking car pleasing to the eye, without being too radical (usually, GT's and related are another story). And when you look at it, you know it is a Porsche; for some people, that is simply a status symbol, and just bought the car because their recent bonus could cover it. For myself and my father, among others like the members of the Porsche Club of America, however, the fact that you can look at it and immediately recognize it is a source of pride: "I own a Porsche, a damn fine piece of automotive engineering, and a brilliant combination of luxury, power, and practicality".
Not everyone looks at their Porsche and thinks that, but I know there is a decent sized population of owners who do. Hence why I feel much more attached to Porsche (and my bias ).
As for Ferrari, I have never even sat in one, so I do not really have much to say. I can say that I really enjoy their designs, but I often find them a little too striking even when I do like the shape. I almost feel like they are not meant for the road, which is probably half the point; still, something just does not seem right when I see an F430 go by on a road. I feel that when I do see an F430 go by, it should not be just idling along, happy and content at 2,000RPM, and is too much of a treat, and an exceptional sort of toy, for that. Still do not mind seeing them on the road though
"I'd hate to die twice. It's so boring" - Richard Feynman, last recorded words.