Looking at traces on http://glideport.aero is a good way to understand the difference between trackers (Not loggers!!!).

Spot traces are shown without altitudes

DeLorme In-Reach traces have altitudes

Phones show fully detailed traces (i.e. you can see thermaling).

If you watch a race or maybe flights from your home airport you can see the variability in these traces. Each technology is different, both in cost and performance.

Alan