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Main thing is the batteries are likely to last the whole way so no need to faff replacing them and the controls seem a bit more intuitive.
The Trace only has one button and is either on or off so I'm not sure about anything being more or less intuitive.
It also uses the same 4x AAA batteries as the Gen3 so I'm not sure why you think the Gen3 would last longer than the Trace unless it has more power efficient GPS circuits in it, which I doubt.
That was my thinking. Does anyone have an opinion on the SPOT 3 vs a Trace? It looks like they actually use the trace for TCR and it's smaller and cheaper.