How good is to delete stats before gathering it again ?

Hi, Can you please tell me which one is better approach and why ?

Approach-1 :
1. delete stats on table (  DBMS_STATS.DELETE_TABLE_STATS )

DBMS_STATS.DELETE_TABLE_STATS(ownname=>'OW1',tabname=>'TAB1');

2. gather table stats ( DBMS_STATS. GATHER_TABLE_STATS )

dbms_stats.gather_table_stats
(ownname    => 'OW1',
tabname      => 'TAB1,
estimate_percent => 25,
method_opt => 'for all indexed columns ',
degree        => 8,
granularity  =>'ALL',
cascade     =>TRUE );
end;

Approach-2 :

1. gather table stats ( DBMS_STATS. GATHER_TABLE_STATS )

dbms_stats.gather_table_stats
(ownname    => 'OW1',
tabname      => 'TAB1,
estimate_percent => 25,
method_opt => 'for all indexed columns ',
degree        => 8,
granularity  =>'ALL',
cascade     =>TRUE );