There's no doubt that the Fiorano is one of the world's most spectacular vehicles. It's able to handle, go and brake like few front-engine cars, but lest we forget, the SLR came out before the Fiorano did. Now of course, that's not to say the 599 copied the SLR in any way, but what I am trying to say is that SLR's achievements of when it first came out cannot be ignored. Sure, now-a-days the F-car might better it in most everything, but the impact of which the SLR made not only upon me, but car enthusiasts world wide mustn't be forgotten.
I remember when the SLR's Supertest first arrived; I was shocked that anything which such weight, anything with a conventional (more or less) transmission could acheive an N'Ring lap time in just 7 minutes, 52 seconds. Additionally, the braking; aerodynamics; acceleration; and handling figures further left most dumbstruck.
The time at which the SLR was released, it was a one-off. It had no peers.
All I am trying to say is that we mustn't forget the achievements which the SLR did for the supercar world.
Anyways, that's enough of my dribble; let me continue onto the actual question of the topic.
The Fiorano is an interesting prospect. I got the chance to see one on the streets of Vancouver about a month ago now and while I was initially excited, It didn't hold my interest as long as I had hoped. When I first saw the Carrera GT, the Murcielago and even the SLR, they managed to hold my attention for a much greater deal of time.
While I think the 599 is the best Ferrari since the monstrous F40, I frankly found it starving my enthusiasm. Suffice to say, I found SLR to be the more interesting of the two vehicles.
From an interior point of view, I must admit to not being overly satisfied with either. Most definitely not a fan of the 599's actual layout and design, but have found the SLR's interior (specifically it's center console quality) to be rather awful for the price tag it wears. Perhaps though, "awful" is too harsh of a word; It's not
that bad, but most certainly could have been better.
Performance: neither are lacking
Engines: The Fiorano's V12 is great, but like ree, I absolutely love that burbling and blaring supercharged V8. As Clarkson once said, "it sounds like the God of Thunder gargling nails". Furthermore, I've always had a fascination with large sums of torque (lol..) and the SLR's 5.4 litre unit, does not fail to deliver.
So, while the 599 may be the better vehicle in everyway, I must go with my heart and my heart says: "choose the SLR".