That is an oversimplified question. It is impossible to properly answer based on several bits of missing information.
Look at what leads to understeer and oversteer as one guide, Also take consideration that the automakers built the cars with a strong bias toward safety and control. UNDERsteer is naturally self healing. One understeers, then slows down until control comes back to them.
One rule that seems to hold true: The end of the car with the greatest roll stiffness will lose traction first.
Stiff leaf springs and a fat rear sway bar on a car with stock torsion bars and no sway bar would very likely result in oversteer when subjected to quick maneuvers.
All high performance sports cars have different wheel and tire sizes front/rear. Of course, any disparity between the grip is offset by chassis engineering.
I run a 295 rear tire and a 275 front. Mine is neutral until I stab the throttle to kick the ass end out.