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Well, offhand I'd say the inverter is better just because you can use it to power things other than a laptop. And if you get it from the same site as the GPS you save on shipping.
I haven't had much luck in the past with the multiple-voltage adapters before, they seem to go out fairly easily. But if you have a lot of devices that could benifit from a multiple purpose adapter like that it might be the way to go for you.
All things equal I'd go with the inverter, but it comes down to what you think would fit your needs better.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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