Methods for uploading SAP data

Which method should I use for uploading data?

1. Call transaction
2. Batch Input Method
3. LSMW
4. BAPI

You use LSMW to do data migration –- initial uploads of data and bulk data loads. Use BAPI in all other situations, if a suitable one exists. Otherwise, use 'Batch Input' if you want to be able to use SM35 to manage the input. Use 'Call Transaction' if you want to do something else.