Owning a couple of the gps addons, I would recommend buying the xgps150 vs the three other models (that I know about.)
Any of these gps receivers (direct plug in or bluetooth) are much better for aviation use than the built in antenna, due to placement issues, and performance at high altitudes/speeds. (The built in gps will not work at all in the flight levels.)
For ground use, the advantage would be that they can be used with wifi only units that people already own, or used with multiple devices if someone upgrades frequently. (You can buy the cheaper wifi units vs the more expensive cell phone ones.). Remote mounting may be important in marine uses such as chart plotting as well.