>>5811639I'm not sure in terms of popularity how things work: it may depend on what local artists can actually provide, how educated buyers/gallery owner are. Typically, oils should sell for more money, as they are (generally) more durable and require (generally) more technical expertise than other mediums.
But then, you have to find balance: not everyone can buy a huge 20K$ oil painting, so doing small size oils you can sell for a few hundreds is a good choice. Or, varying mediums to lower the price, but you may or may not have to work the same amount of time for a lesser price with other mediums.
Also, mediums can have different kind of convenience: oils (on canvas/panel) "dries" slowly, requires varnishing after months of "drying", take spaces, can require a certain assortment of additional materials, brushes are troublesome to fully clean. While watercolor fully dries "instantly", takes the space of a sheet of paper, most of the time, requires only water to work with/to clean brushes.
You usually can't go wrong with oils, but be mindful of what can and cannot sell, and don't get stuck on the same non-working solution. If you want to go professional, you have to learn the pros & cons of all solutions, and learn to balance them to achieve your goals.
