Two different answers to beta curiosity
The official Advance Server is the publisher's own program: limited slots, official builds, early access to upcoming content. Unlock Beta FF is a lightweight third party dashboard tool for account style features. Similar curiosity, different products.
Head to head
Purpose: the Advance Server exists to test unreleased game builds; Unlock Beta FF organizes account and dashboard tools. Size: the official client is a full game download; this tool is 31.5 MB. Access: the official program rations slots and activations; the tool needs no activation code.
Which fits your goal
If you want to play unreleased content through official channels, chase the Advance Server. If you want the dashboard, binding, and unlock style menus described on this site, you want Unlock Beta FF v98. Our name disambiguation guide clears up the other common confusion.
A note on choosing tools
Whatever you pick, get it from its official source. The beta tool checklist shows what to verify before installing anything, and the official Unlock Beta site is this tool's home.
