There are many brands fewer trampolines available on the internet, but these are often unsafe and unstable. Also, cheap trampolines are usually not intended for digging and are not weatherproof. Therefore, choose reliable brands such as Berg, Exit or Salta.
With a well-known brand, you often also have a good warranty on the product. If there is something broken or faster wear than usual, a new item will be delivered, or you can get your money back.