There's no best way to manage access. It depends on what you want to achieve, your offers to paying members or restrictions for non paying members. What payment system you want to use or have to use etc.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.