I'd say Kenkonken by miles. Shenlong's are easier to acquire, but they do nothing for your puppet. If you're playing faux-Black Mage by way of your Spiritreaver automaton, which is not that uncommon, the hugely impaired likelihood of Overload from Kenkonken lets you play more aggressively. Moreover, the Aftermath from Stringing Pummel affects both you and your automaton. I cannot imagine the straight damage on Shenlong's (since you'll either have Accuracy from a 100% Stringing Pummel or you'll just compensate) can really compare to the utility of Kenkonken.
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