What is the best filler for the temple area?

There are many fillers which work in this area. I often use autogenous fat. It looks and feels natural. Often this region requires 2-4 syringes of conventional filler on each side.  Sculptra and radiesse and  Bellafill are other options for this area. Bellafill can last up to 5 years. 

I mostly use Sculptra and Voluma for the temples, but Radiesse, Restylane Lyft, and others are options as well.  Bruising is possible but mostly this is a well tolerated treatment.