The most popular
HA fillers these days are Voluma (and Volux) and Teosyal Ultra Deep and Ultimate.
I read that Voluma is easier to mould but it's more prone to cause lumps and a bit soft, while Ultra deep is longer lasting, firmer but very difficul to mould.
Some clinics also offfer their own "blands" where probably mix different fillers to balance both properties.
Any direct experience someone can talk about?