I agree with Aika here. Ninja Assist is still the best one to get power which is also worth spending. Unlike Secret Scrolls, it is a bit expensive which only gives a bit of power. For me, I'd upgrade my Ninja Assist Cards first up to Level 9 before I start upgrading my Secret Scrolls.
The secert Scrolls are expensive yes. But it provides a lot more Singlar Int to all position in large volumes which is good as well as side stats. It's not bad. Then again Im a whale and money isn't an issue for me. So I spend mostly spend on power anyways. But both are good. However if you're free to play focus on Ninja Assits.
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