Differences Between All the Juvederm fillers?

I understand your confusion. First of all, the names of the Juvederm products are different in Europe and the US.  The difference among these products can be confusing even to experienced injectors.  The Juvederm products are all made of hyaluronic acid (HA). The difference between the products has to do with the configuration of the HA - whether it is tightly compacted, loosely compacted, the ratio of light chains and heavy chains, the chemical bonds between chains, particle size and quanity of HA per ml. What matters most is the selection of the right product for the right patient for the right location.  Each product has unique characteristics that determine its behavior when injected -  hardness of the product (how much it can lift), hygroscopic nature  (how much water it will imbibe), cohesiveness (tendency of the product to diffuse or stick together), needle size required for injection, etc. Find an expert. Someone who is knowledgeable and artistic.  Buying filler is not like buying soap or tissue paper. It is the talent of the injector and not the product that will determine the ultimate outcome.

Dear LMc77, 
Thank you for your question, it can certainly be confusing when you hear about the various types of filler out there. 
Firstly its very much dependant on what area of the face you are having treated as to what filler should be used and what look you require. 
I can see that you would like your lips to look fuller. The options available for you would be:-
Juvederm Ultra 3 (1ml) this lasts around 6 months
Juvederm Ultra Smile This is the same product as above but comes in 0.55mls instead of 1ml.
My product of choice in the lips though would be Juvederm Volbella which lasts for around 1 year and is a much smoother and natural looking filler. 
Scientifically the different types of fillers are related to how the hyaluronic acid is configured and cross linked. 
I hope that has clarified  the fillers a little. Your medical practitioner should be able to explain this in more detail to you.
Wishing you all the best.

The difference is principally in the degree of cross-linking and this affects both the amount of water that's drawn to the material in the short term affecting short term swelling which makes us correct our injection technique for differences that might not be present a few days later. The characteristics of the injection are different due to the viscosity of the different materials. Ultimately the choice of Hyaluronic acid filler is very personal choice made by the clinician.