The battery packs (Li-ion) are much more efficient. They last long between charges, charge in the same amount of time, and can be recharged more. They are, however, more expensive than any AA, even rechargeables, on the market.
The other downside to the lithiums is that they're usually proprietary: if it dies in the field and you dont have another, you're up a creek. If your AA batteries die in the field, you can get another set at just about any store.
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