You pose a difficult question. If it truly was just a philosophical one, it would really be the equivalent of asking whether it's better to have a lot of fun rarely, or a bit of fun often. Well, I don't know the answer to that! Saying that it depends on the exact experiences, and that the relative importance of those will depend on each person, is an obvious and boring answer!
But, if we were to make the question more concrete, then what exactly are you asking? Whether to buy a dedicated weekend fun car, or whether to upgrade your daily driver to be more fun? Or is it asking what one would do if they could buy only car? It is a bit undefined.
Still, I can try to offer some insights.
The first one is that while a good car can be extreme, how special and exciting it is, has to be in proportion to how undrivable it is. If it's very daily drivable, it can be good without being exciting at all. If it's really undrivable, it has to be exceptionally exciting (but more on this later!).
The second one, would be that while how exciting and special a car is, and how daily drivable it is, are usually at odds with each other, it doesn't necessarily have to be the case! While making a fun car more daily drivable usually means making it quieter, more comfortable, more isolated and more automated - and that inevitable makes it less special because it means it's now the same as every daily driver - there are still things you can do to get some of the specialness back. Like having a really exciting, high revving engine (preferably NA and with more cylinders than 6 - since everything is low cylinder turbos now), having an evocative interior (preferably analogue - since every eco box has digital screens now), or with how the car handles even at low speeds (such as having a feelsome, direct steering). If you find the right car, the car that finds that perfect compromise, you can have your cake and eat it too. Those really are the all time great cars.
The last one pertains to usage. Are you using the car as a daily driver and want it to be fun, or are you using the car just for driving fun itself? This is, mind you, not the same question as the previous one! Although it makes sense that you would use the more daily drivable car for your daily driving and the special car just to have fun, you could also use the special car for daily driving, and you could use the daily drivable car for fun.
Here is where my big opinion comes in, though! Because I don't think there really is such a thing as "driving a car for fun". Not in the sense that you go from A to A, at least. Just going for a fun drive, with no other goal than to have fun driving, might be fun occasionally, but it also gets boring very quickly. If there is really no goal behind the drive, then the standards for how fun the drive has to be go up - and it's hard to make it really fun. That's why you plan trips - even if those trips are just paper thin excuses to have fun driving the car. But, as soon as you do that, the car has to be at least somewhat daily drivable!
So where does this leave us? Well, for one, I would say that if a car isn't at least drivable enough to take on a trip, it doesn't matter how exciting it is. I am not sure the GT4RS would qualify as being too undrivable, but some of the more extreme cars would. And for two, you should be greedy and get both! Find the car that offers both the highest peaks and that you can enjoy driving often. As for what car that would be - that goes back to the boring answer of fitting the particular person. But I believe there are such cars and that's where the most happiness lies!
Hmm, I guess it's still the boring and obvious - and generally unhelpful - answer, but I did the best I could, I swear!
