Which car can perform better a 8 valves car or a 16 valves car?

Which car can perform better a 8 valves car or a 16 valves car?
16v is somewhat more prone to problems than 8v in that there is double the no. of valves to take care of than an 8v engine. However all said and done, the difference is not that much except for a bit more effort/complexity involved in 16v engine repair. State of the art is such that 16v engine will, in most circumstances, give no more problems than an equivalent 8v engine. So no worries on that front. 16v engine for the same capacity will be a bit more expensive than its 8v equivalent - but it will have better performance.