one mile per divine rank.
-As a standard action, a deity of rank 1 or higher can perceive everything within a radius of one mile per rank around any of its worshipers, holy sites, or other objects or locales sacred to the deity.
OK, so I copied/pasted more stuff than needed. Some of that stuff can be replicated by spells. But the fact it is all automatic and not subject to any chance of ever being dispelled, reduced, removed, etc. (even by epic magic) is pretty useful.
Plus the deities can create magic items, use domain spells as SLA's, and still get to choosits DSA's. I'll take the divine rank any day.