User Preferences, recent searches etc... are stored at the database level and every arserver has access to it. Also in a load balanced environment usually all the user connected servers will have same ar.conf settings. I always thought it is better to use Use this server option in a load balanced server group environment so that every server that users connect to becomes itself as a preference server for that session. May be if there are any server specific user preference settings or ar.conf settings then using a a common server as preference server makes sense.
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