Personally, unless it's giving you trouble, I'd continue transferring digitally (right?) using the microtrack. DAT transfers are asynchronous (meaning there's no real "back and forth" between the devices to assure integrity of the digital signal). Given all of the background tasks going on in a computer, it's surprisingly easy for a computer to miss/skip parts of the data stream sent to it, resulting in dropouts.
Since the microtrack is designed to receive a digital signal (and is dedicated to doing so), it should do a much better job of capturing the data stream from the DAT player. And, since transfer of the flash drive to the pc occurs in a synchronous manner (i.e. the integrity of the datastream IS confirmed during transfer), you stand a much better shot at avoiding corruption during transfer.
What issues are you having using the microtrack?