Currently owning a GT40 replica and an Ultima CanAm they are both very different cars in styling, performance and era, but both equally invoke a smile from ear to ear each time I drive them, but for very different reasons. The GT40 instills Nostalgia and a certain raw crasness, it's load obnoxious and I feel like an arrogant teenager again. The Ultima has more modern lines, but not too sharp, then there's the shear power and handling, that evokes the mid life crisis feeling, made it this far but no F-car for me.
Being primarily a Ford guy (and still a teenager at heart) at the end of the day if I had to sell one it would probably be easier to let the Ultima go.