I only see two (2) differences between the two. The WT has weather and traffic which could be nice in the miami area, however, there could also be a fee involved (didn't look that far into it). The W has a "car locate" feature which probably amounts to giving you a spot on a map where your car is parked when you walk away from it.
In summation, if you loose your car, you probably can't operate a GPS in the first place, and, if you need traffic or weather updates go with the WT.
In the end, same thing w/ one less feature getting the W.