As for the two, they’re very different cars. The 612 Scaglietti is a car that you could use daily. It has four usable seats with decent luggage space, and is probably the most complete, useable GT I’ve driven, that also happens to handle.
The 550 Maranello is a weekend car. It has very little luggage space, two seats and only comes alive at speed. Around town it’s a bit of a sod, but at speed it feels a little bit more magic, largely down to the manual box.
The 550 is an event car, in the Ferrari mould. It’s a lot more subdued than a mid-engined Ferrari, though.
The 612 feels very much like a Maserati - it’s no less exciting but so much more useable, so perhaps less of an event simply due to how competent it is.