The main difference is maintenance, less for the enviro type decking and more for the hardwood as it needs to be restained or repainted. Keep in mind though that the enviro decking can get hotter underfoot due to the mixtures in them and there are also less of a range of colours available in the enviro decking.
Hope this helps, thanks for your question.
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Luigi Rosselli Architects
The Luigi Rosselli Architects team