Since I have neither, I'd go with a cell phone. However, I don't really have any use for either. I'm happy with my desktop, and have lived quite easily for many years without a cell. But, I would choose a cell because it would be more useful in the case of, say, an emergency. It also would be useful if in a store and you saw something but needed to check a size, quantity, etc and could call home and ask. But mostly, we have Sync in our car, and it would be cool to optimize Sync to its fullest. Having a cell would enable getting turn by turn navigation via Sync, automatic 911 calling for accidents, sports scores, and other cool features.