Is that so? Funnily enough I would suspect that the choice of car and bike would have a considerable affect on which one comes out first in that argument. A decent sports bike can brake at over 1g which is considerably more than most cars are capable of for example.

As has been stated already a car cornering hard is effectively only being gripped by two wheels (worse that that actually as the outside front wheel is actually the limiting factor of cornering grip on a car). Now factor in mass, coefficent of friction of your typical car tyre rubber (which for all but the most exoteric sports rubber is no where near as high as standard road rubber for a bike - to say nothing of road legal "race" compounds that are readily available), contact area, shearing forces over the contact patch, suspension capabilities etc and I think you'll find the argument is nowhere near as clear cut as people think.

In case you think all these things are unimportant then consider why 125cc race bikes can corner faster than motoGP bikes despite having tyres that are much thinner and the likes of Lotus Elises can outcorner just about any car on the road despite not being blessed with anything wider than 185 tyres.

GTM