There are many different types of professional acrylic paints in tubes available for any skill level of artist. The following to look for is Artist Grade (or Student Grade), Professional Grade, Value, Consistency, Evenness, Drying Time, and Viscosity. When you are beginning any job make sure to decide what you will need to make your art work easier for you.
The artist grade acrylic paints are specifically used for panels, paper, boards, and canvas. The artist grade is pigmented that is of the general consistency of oil paint that will preserve on brush strokes.
The professional grade acrylic paints are geared more on achieving pigment load and a higher performance on the colors. These types require an expertise in dealing with the mediums to successfully even out the colors. Artists who work on small scale works will use this type of grade.
High Viscosity paints are designed for higher bulk solids, which are great to work with impasto and knife painting. The higher viscosity paints are used primarily for artists who need to have the brush strokes preserved.
Value, evenness, and consistency are the final aspect of types of acrylic tubes to use. These grades are more suited for the adult learners as they will even out pigments better and have more of a uniform surface coverage.