There is no definitive answer, but acrylics are widely favored by beginners as they are easy to use and do not require any special supplies. The downside is they dry very fast, which can make blending and correcting difficult. You can also try watercolors, which are clean and simple to use, but require more control and precision. Oil paints are more challenging to use and require more supplies and resources, but they offer more flexibility and richness.