None of those. They're both hugely overpriced. If you really need twin U160 channels, use a Tekram 390U3D. You get LSI's excellent dual channel U160 single chip SCSI solution on a 64-bit 66 MHz card (backward compatible). Alternately, there's 390U3W that uses the same hardware to offer one U160 channel and one legacu U/UW for your slower peripherals. Tekram also use LSI's own SCSI BIOS and mature driver set, so there's nothing lost from not using LSI's own, more expensive host adapters.
Also to be counted in, Tekram's retail boxes pack everything you need to wire your drives up, cables, terminators et al. LVD SCSI cables cost quite a bit if bought separately.
Counting the more complete retail pack in, we're talking from 150 to 200 dollars cheaper than the Adaptec solution, with absolutely nothing lost on the performance or quality side.
regards, Peter