Sony q28A or Sony q30A

I am planning to buy either the Sony q28A or the Sony q30A. I would appreciate to hear your reccomendations. Can someone tell me what the difference is betwen these two. I also read on these forums that these are actually LiteOn drives.

The Q28A is a 1693S and the Q30A is a 1635S.

I would choose the Q30A, because the it uses a newer chipset.

You could also have a look at the LiteOn 160P6S.