599GTO VS F12TDF

So a friend of mine offered me his F12TDF (he has 2) for a very good deal arround $660K.
Also, another friend told me about a 599GTO I could put my hands on as well for arround $550K.

Both are very low mileage cars (less than 4K miles).
Great prices and realistic in a way.
I do love both cars. But the difference in price is not that high relatively!
I am not sure which way to go if I decide to pick up one of them. I am collecting for my joy and personal use, but ofcourse buying smart is the way to go.

I do have an F12 in my current collection, which I guess would be wise to sell if I will liquidate some of my cars if I chose the TDF.

What do you think about this?

Any suggestions, value preferences?

Any tips regarding production number effect on limited cars such as this scenario or other limited Ferraris?

Any other suggestions for another model for that kind of money?
All answers are highly appreciated.

Note: I posted on FERRARI DISCUSSION as I believe it qualifies to be here IMO, as it has a general "limited essence" in a way as well.
If not, any of our most respected moderators is more than welcome to transfer the post.
Thanks guys,,,

 

Nope, not USA car.
I don't live in the US.

 

But that is interesting BTW.
I find prices relatively cheaper (specially Ferraris) in the US compared to EUROPEAN or other parts of the world.

For example, other than used F cars, U can get a brand new G CLASS 63 for $180K + -
Good luck with that in other parts of the world ($240K +-)
As I understand, the bigger QUOTA the US gets, helps dealers charge far more less than other dealers in other countries.