A Ninja is just not that good of a bike.
Nor is the Porsche that good of a car.
But the Porsche can out corner the bike. With the right engine options it is quicker. My 1989 SHO could out pull a Ninja off the line.
Because I prefer a four legged chair to a two legged stool to sit on (for stability reasons) I will go with the Porsche, only if I had to let go of my Miata.
But I will take a Miata over either of them.