I am almost never in a place with Wi-fi access. I can download via 3G at my doctor's office, home, etc. Very handy for me. I do sometimes download via computer, too. If you always have wi-fi access, then you can stick with the wi-fi version. Also, if I am on vacation, I am more likely to have a 3G signal than wi-fi access, in the places I tend to go.
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