how to determine whether we should reorg the table or not ?

Hi,

In our database, there are few tables with 7 to 15 gb each in size and our total db size is somewhere around 300G-500G.

How do we say that we need to do reorg for this table or not ?

I mean, we can check what is the high water mark for the table in the dba_tables after the analyze table is done but is there any script/sql which can say that 'reorg required' for those reorganization is a must so that it will free up the unwanted space to which it has got allocated and for those which is not required 'reorg not required'.

I can determine the empty_blocks, blocks from dba_tables,dba_segments after analyzing a table. But on what primary basis do we say that we need to reorg the table or not ?

For me as of now, performance is not an issue. So apart from performance issue, kindly let me know what are the other factors which will decide whether we should reorg a table or not ?

Let me know if you need more info.

Waiting for experts comments !!

Note: I have posted this Q initally in the product info section under this oracle but got very little or no response. So want to try by posting the Q under directly oracle.
   
Thanks