sailor sakura for azure fang and crimson fist is a MUST HAVE ninja regardless your power, the point is if is this one the event to get it and my reply is a no.

If you aim for power the best place to invest your coupons currently are myoboku scrolls in konoha gift shop if you are over 70k, if you are under 50k go for lucky board and get charm packs (if your charm levels are under level 5) and sakura fragments with what's left. Anbu cloth is worth it only if you are over 70k power but not this event since konoha gift shop gives us a better option.