Plastic end tanks are less susceptible to deterioration while sitting idle than brass. The same conditions under which a plastic end tank may fail (other than normal aging) play just as much of a role in the premature failure of radiators with metal end tanks. If you've had a failure of the plastic tank due to something other than vibration or impact there usually is a problem with the cooling system... excessive pressure or excessive temps due to coolant losses.
I do prefer all metal radiators though as they are more likely to survive a sharp impact or vibration damage due to hardened bushings.
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