In all my years as an artist I have used many mediums. I believe every medium really has its use. Like color pencils as mentioned, there are soft and hard leads, greasy or powdery etc. When I was young I discovered beautiful artwork can be created with cheap crayons or the most expensive oil paints. What I find more common is if you know what results you want you need to try different products and see what feels right for you. Everybody has a different eye, different hand movements and pressure etc. So one needs to be specific if asking for advice on products, perhaps with samples of work you'd like your style to resemble. Tools however I find different. I believe the right tools like good brushes are extremely important.