If you're looking for the fastest access to new updates, then level 5. If you want to see all past content without additional rewards like art orders, then level 1. All upcoming release dates are available for free, and you can check them out or write to me and I'll answer your questions. Also, if you want access to beta tests (they're not always that extensive), you can choose Tier 2. It will give you full access to the entire content currently available on Boosty. If you're not interested in beta tests, feel free to choose Tier 1.