Merge replication offers two subscription types: server and client (referred to in previous versions of Microsoft SQL Server as global and local, respectively). Subscribers with a server subscription can:
Republish data to other Subscribers.
Serve as alternate synchronization partners.
Resolve conflicts according to a priority you set.
Most Subscribers do not require this functionality and can use a client subscription. Client subscriptions still allow conflict detection and resolution, but Subscribers are not assigned a priority: the first Subscriber to submit a change to the Publisher wins any conflicts that might arise from that change.
Subscription type cannot be changed after a subscription is created.