There are many different brands of fillers , but the main difference is that one group ( Hyaluronic Acid ) provides an immediate filling effect but does not stimulate significant amounts of collagen , whereas the other group known as Collagen Stimulators ( Radiesse, Sculptra, Ellanse) stimulates your skin to produce large amounts of collagen.
For your lips, it’s best to use Hyaluronic Acid as it’s not suitable to use collagen-stimulators here.
1cc of Hyaluronic Acid can cost between $500-1200 depending on the brand and the doctor’s reputation. You should view the doctor’s before after pictures during consultation and love the results he/she produces before you go ahead with the treatment with him.
Usually filler trainers (doctors who conduct training sessions for the filler companies to educate other doctors) are a safe bet if you really can’t make up your mind.