lsmw, bapi, bdc- session, bdc-calltransaction

Hi Experts,

Can you please tell me which method should be used to upload data

1. lsmw

2. bapi

3. bdc-session

4. bdc-calltransaction

which method should be used when?, why?, advantages?

I know the process of doing all this but my question is which method should be followed and when, what will be the advantages and disadvantages.

points will be rewarded.

Thank you.

regards,

Admir.