Sheepy - The important thing is not which is the most accurate but is there a substantive difference.
In Oz years ago we had a met office in melbourne and one in sydney both of these produced a chart for the morning paper of the (alleged) actual (not forecast) at 3pm on the previous day. If they were basically the same then the aviation forecast could be treated with a normal degree of caution. If as was sometimes the case they bore little resemblance to one another then the forecast could be assumed to be worthless.