Originally Posted by Drip

Well, not really far more efficient. More like, slightly more efficient.
20 snow jewels for 700 presents or 20 snow jewels for 690 presents.
You'd need 1400 Snow Jewels to get one entire run ahead of doing the "cheaper" run. And by the time that happens, you'll have cleared the gacha several times over already

You get 700 with one run as opposed to 690 for two; I guess it's not much of an issue if you've got a lot of time to kill though.