Which one of these two queries would be fastest?

[Jan Pieter Kunst]

Assuming everything is properly indexed.

(1) INSERT INTO my_table_1 (field1, field2) SELECT DISTINCT field1,
field2 FROM my_table_2;

or

(2) INSERT IGNORE INTO my_table_1 (field1, field2) SELECT field1,
field2 FROM my_table_2;

Is there anything to say about this in a general sense, or does it all
depend on the data in question?

Thanks,
JP