Either the mac or the PC can capture full D1 uncompressed or even High Definition video, surely you realize thats better quality then the 5:1 compression you are getting on the DV tape
Depending on hardware you're using. With help of decent PC card (bt8x8 chips produce awfull interlaced output with occasionaly broken chroma information) it will be surely better to grab uncompressed raw data :-)
plus the audio issues inherent with the format.
What audio issues are you talking about? For my own use a 48kHz uncompressed 16-bit PCM provided by my camcorder is sufficient

PS. I do not copy the material onto DV tapes. Instead, I let my camcorder to digitalise the analog input and output it directly through ieee1394.