The answer:
If you own a PC, want a good device that doesn't get you lost but you don't want to do too much route planning of your own (ie you are happy for the device to do it all for you) then buy the Tom Tom
If you own a Mac, want to plot your own routes and want a reliable device, then buy the Garmin
Simple as that.
If you own a PC, want a good device that doesn't get you lost but you don't want to do too much route planning of your own (ie you are happy for the device to do it all for you) then buy the Tom Tom
If you own a Mac, want to plot your own routes and want a reliable device, then buy the Garmin
Simple as that.