Data Services Performance

Hi All,

I just have a basic question regarding performance

Option 1 – Source(Table from source system)->Query(Filter using where clause)->Target Table

We are reading everything and filtering in Query - My assumption is it will do full load into source table and filtered in query(Where Clause)

Option 2 –  SQL Tranform (Filter using select * xyz where  xyz is source system table)->Target Table

We are using the sql and filtering at the same place  - My assumption is the filter(Where Clause) is pushed to the source systems   - Is this better in performance

Which one is better in terms of performance

Thanks in advance