Do you agree that 95% accurate information available today is more useful for management than 100% accurate information available in future?

Usually yes. As far as the information is required for management, time of availability is equally important. If you can get the information in time with slight deviation from100% accurate, it would be better to use the information in hand rather than waiting for the100% accurate information. Slight vatioation in the information does not make difference in the management decision making rather information not available in time makes huge difference. 

If the Financial accounting angle is meant by the question then the answer is NO - as it would indicate a lag in the up to datedness of the accounts , since FA is historical.

If Costing , Budgeting and Financial Management is meant by the question - then the5% whether it is material relating to its effect on Cost Data , Variance and Exposure or Risk in the same order would determine its efficacy since these disciplines are prospective unlike FA which is historical . Materiality and the nature of the Business , its volatility in the business environment would be factors that would go into the consideration as to whether a5% difference based on Time is justified . In the short term it is easier to guage this but if the time frame is quite long , short term benifits may be possibly forgone . Ultimately it would be the Judgement , knowledge and Skill of the FM that would decide this factor.

not always time