GPS for PDAs: CompactFlash vs. Bluetooth

I guess I’m looking for pros and cons of compactflash vs. bluetooth for a GPS receiver, which is why I put this in GQ. I suppose it can also be considered IMHO.

Does anyone have any experience/advice to share? I’m trying to put together my in-car navigation setup. I don’t have the PDA yet, but I’m leaning towards one of the Dell Axims.

It seems to me the CF would be a bit neater with one less separate piece. At the same time, maybe bluetooth would have better compatibility with future PDAs?

Thanks in advance for any info.