Cedar or redwood can be used without painting, and are rot resistant. Chemically treated wood should be avoided. Clay has been around for a long time and is used often by gardeners. The clay is porous and water is lost from the sides, also it can break easily. If you need mobility this may be a consideration.
Plastic containers come in a large variety of sizes and styles.
Choose the more durable types of plastic, in order to last a few seasons. Pots and containers are not fixed items, they can be moved to suit your needs, or to lengthen their growing season. When the weather cools move to a more protected area. No hoeing or weeding makes the busy person's life much easier. The popularity of container gardening has created the development of special plants designed for this specific purpose.