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Do you mean the base growth rate or with a Castle and all possible armies?
Weekly growth rate from a fully built city without the Grail.
Forgot to add, battles on neutral territory (i.e., without speed bonuses), without war machines.
Added 2 minutes later
Yes, Conflux looks like a good contender for victory.
Although it is possible that there will be no absolute winner. That is, no one
will be able to win against all the others. For example, an Archangel (in
a one-on-one battle) defeats a Titan, but loses to a Behemoth, which
loses to the Titan.