Performace Which is better ? : Bapi inside a loop OR Select from Tables

Hi Gurus,

I have a report which displays purchase info records.

If I am selecting from tables i need to use EINA, EINE, EORD and some other tables.

There is a BAPI which gets all purchase info records specific to a vendor , material , purchasing organisation.

QUESTION: Performace wise which is the better Approach, either selecting from tables or BAPI for Purchase info records

Regards

Avi.