I highly dislike the looks of the 365 GTB, I will however buy the GTO.I thoroughly enjoyed driving it. It sounds and drives the way I expected it to.
It IS an MR drivetrain car, so has some of the handling trickiness associated with those, but is not undriveable, in that sense. Just be mindful of lift off oversteer.
If you want to avoid the lift off, the '71 Ferrari 365 GTB is a dream. You can try that car out as a "Courtesy Car" in arcade mode, before taking my word for it and buying it.