The two look quite different. The hesalite in my view has a much warmer look, with more extreme refractions at angles and a nicer aspect around the edge, all of which makes it more interesting.
It's more of an indulgence though, than a day to day factor. Not really something that a passing glance would reveal.
Sapphire has the scratch proofing advantage obviously, but that is outweighed by the appeal of hesalite for me.