As said, it depends in what context. Fun factor, speed, value, ease of use, appearance, nostalga. The list goes on but in the end, they're all pretty great.
The F430 is a technical masterpiece, great handling, noise, power, it's all there. The 599 then steps in as a big heavy grand tourer packing a fantastic motor and noise, bags of acceleration but not the best handling car in the world, although it's not exactly shabby all things considered.
Then the old Ferraris bring something which should be just as important but sadly seem lost in this modern world of online racing obsession. Character, I personally can't drive the F40 without smiling like a small child, it's nowhere near as stable or as quick round a bend as an F430 but it's an absolute blast to drive.
Unfortunately, I've never spent much time with the 512BB but thats something for me to do in the coming days.