SQL DateDifference in a where clause

Question

I m doing a query as follows:

SELECT
  *
FROM a
WHERE DATEDIFF(D, a.DateValue, DateTimeNow) < 3;

Answer 1

Microsoft's documentation at http://msdn.microsoft.com/en-us/library/aa258269%28v=sql.80%29.aspx suggests that instead of DateTimeNow you should have getdate(). Does it work any better that way?