ABAP Query Performance

Hi,

I have doubt regarding below two statements.

Statement1 : SELECT X Y Z FROM ABC INTO WA_ABC WHERE A = 1

Statement 2 : SELECT X Y Z FROM ABC INTO TABLE IST_ABC WHERE A = 1

Both query using primary index and Both query returns only single record.

Kindly suggest which one is faster with proper justification

Thanks & Regards

Kishan Rana