But if OP doesn't have any ninjas at this moment that works with sailor, they have to work harder to get the other ninjas to form the team, which is why me and SumTingWong asked what ninjas they have to even consider choosing ss over anbu before the end of wednesday.

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.

The point is, are you sure myoboku scrolls will be there again in future events? And if they will be will they be there with a cheaper price than 10 coupons each one? No. Are you sure anbu fragments will be there in future events? Yes, and will they cost 80 coupons per fragment like in this event? Surely no and surely they will go down in price per fragment. So, if you are over 70k power, as garv said, the answer is myoboku scrolls that with 6k coupons used grant you way more than 1500-2000 power anbu cloth grants, overall because you are sure to use them in page 1-8 due to myoboku introduction in this event. The issue is where to use coupons to get the best outcome in an event.