What i have found until now is.
In pivot table you can drag the dimensions over the expression. Means Dimension shown as column. This is not possible in Straight table.
In a povit table you can not drag expression in middle of expression, but you can do that in straight table.
Hope this will help you.
this are the difference which I have observed
* Has Dimension limits
*Repetitive data representation
*We can hide the dimension and expression easily
*no sub total options
* Has no Dimension limits
*Tabular format data representation
*We cannot hide the dimension and expression easily
*sub total options
* Less performance compared to straight table