Hp DH16A6L SATA or LiteON DH20A4P via USB?

Hello at all…I’ve this two burners and I want know who are best to scans DVD media for testing quality.
One is HP DH16A6L connected SATA cable, the other one is LiteON DH20A4P IDE connected by USB 2.0 Box.
The HP one start scans from 2x, the other one from 1x.