What is the difference between Ellanse and Derma Veil for face volumizing?

They
are both made from similar materials Polylactic Acid and are collagen
stimulating dermal fillers.
The
Dermaveil comes in a bottle and needs to be mixed whereas the Ellanse comes
ready to inject.   The longevity of
Ellanse is one of its major plus point - it can last up to four years -  so for ease of use and long lasting results
is the one I use most readily in my clinics.