What is better for the lips: Restylane Refyne or Silk?

Based on my experience of performing lip Augmentation  close to 20 years and having done 1000s my advice to you is choosing the right surgeon than worrying about the right product.  The material or tools used do not make or break as much as an injector that doesn't have good judgement proper injection skills and all subtle techniques to give amazing results.  

The answer is neither! Here is the problem.  These are both smoother fillers.  They are runny.  That means a nice lip treatments will migrate in days out of the lips and into the surrounding tissue. I only use Restylane for the lips. It requires a very precise technique. Restylane needs to be sculpted into place. Who is doing your filler service makes all the difference. The Defyne will hold a bit more than the Silk but I don't recommend either product for the lips.