Variety is the spice of life.
Personally, I want to experience driving as many different models and brands as possible.
Driving a Bugatti Type 41 Royale Roadster, or a 1970 Maserati Bora, or my 68 Hemi Roadrunner, or a 1932 Ford Victoria are all equally exciting.
All cars are not created equally, and not all cars are meant to be driven they way you drive. Learning the differences is the wonderful part of the driving experience. You don't drive a 911 the same why you drive a Dart. You don't drive a Durant the same way you drive a Chrysler 200, and you don't drive Ferrari 308 GTS, the same way you drive a Caravan.
I've driven well over a thousand different vehicles in the last 50 years of my life on four continents, and there were very few that weren't enjoyable once you learned to use the car to meet the way it was designed. Whats more, you don't drive in Europe, or South America, or Asia, the same way you drive in the US, no matter what car you're driving.
Driving that 911 is a completely different experience from driving your Dart. One isn't "better" then the other, necessarily, but they are very different and require very different disciplines to be driven well. THAT'S WHERE TH FUN IS.