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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.
The spot 3 is better than whatever I had from tcr in 2016. 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.
whether that is worth the price difference I don't know, how much is it?