It depends on your personal preferences and style of painting. Today, studio quality oils are fine with regards to permanence ("hues" are often equally good as expensive pigments). But if you want paints that have the perfect viscosity and flow, then you should choose artist's quality. It depends on whether or not you often make detailed paintings, or if you make glazes and such things. Some painters choose studio oil paints for certain pigments and artist's paints for others. But you must decide whether or not to use whites that contain zinc oxide. With time, it may cause the paint layer to become brittle.
It's the same thing with brushes. Although most oil painters prefer flat hog brushes, it depends on personal taste. Some artists use expensive easels, but Matisse always used light tripod easels for plein air painting. Pierre Bonnard didn't use an easel, but preferred to fasten the canvas with thumbtacks to the wall. Linen and cotton canvas are both fine, but cheap cotton canvas is sometimes made so thin that it can easily get damaged. However, cheap cotton canvas can often be used, provided that you put an extra layer of gesso on it. Otherwise the paint has a tendency to seep through the canvas.
If you are not going to use oil paint for its structural qualities, then you should perhaps remain with acrylics, because it has fine qualities missing in oil paints. Acrylic pictures can be made very light, like they are shining from within, because the light can travel through several layers of paint. This is not possible to do with oil paints, which tend to become more opaque and dull. Unlike what some people say, acrylics is superior for trompe l'oeil
painting. If the Old Masters had had recourse to it, then they would have used nothing else, because they were very interested in deceiving the eye. In order to paint in a new "light" style, David Hockney went from oils to acrylics, in the sixties. One can hardly do this kind of painting, using oils. /Mats Winther http://architizer.com/blog/hockneys-...cal-modernism/