This depends on your individual needs and preferences. Each generation of iPad has its own unique features and capabilities, so it's essential to consider what you will be using the iPad for and what features are important to you. If you're looking for an essential iPad for browsing the web and watching videos, the iPad 8th generation or iPad Air 3rd generation may be a good choice. If you need a more powerful iPad for tasks like video editing or gaming, the iPad Pro may be a better choice. Ultimately, when considering buying a refurbished iPad, it's essential to research and buy from a reputable seller like Back Market or Apple Certified Refurbished. This will ensure that you get a high-quality device that will last as long as a new one but at a more affordable price.