Best events:

1.Myoboku trial

60 free coupon plus keys and other stuff a day.

2. Mission Mobilization

even with 70% of the box drops being useless or of little use to veteran players, 150 points a day is still pretty good.

3.Kohona great tree

Used to be one of the worse events in the game when it came out,but with all the positive changes,it's one of the better events now.

4.Great plates

used to be an ok event,but now the drop rate of seals and ninja fragz seem to be better than it used to and the ninjas are decent.

5.Fukuramu rebate

the only event that gives you stuff for spending coupons and 50% of the times the rebates are good.

6.Cave key rebate

with gold essence being redeemable at 1050 and 2100 keys used.This is currently the best power boosting rebate since keys are easier and cheaper to obtain compared to advance refine,advance threads, and charms.Plus they don't become obsolete as fast as medium refines/threads, summon scrolls and seal scrolls.

7.lucky stars

who would have thought that the once nicknamed unlucky stars would be on this list.

but with recent changes in terms of ninja frag,summon and seal scroll drop rates. this is actually one of the better events to spend your coupons on, specially if luck is on your side.

8.lucky wheel

everything on the wheel has the equal or better value than what you spend on it.Plus, if you manage to make it to the top 10 there is some extra value in there as well.(from personal experience and observation,the chances of getting lucky with 80 ninja fragz are less than that of lucky stars)

Mediocre events:

1.lucky board

Used to be the best event for players to spend their coupons on and probably still is if you are a new player,but for veteran players, it's just a meh event unless there is a new redeemable ninja or outfit they want.

2. Seven days of welfare

Although three out of seven days are useless rebates, the other 4 days are ok in terms of rewards.

3.Sakura's festival

not much to say about this.it's an ok event.

4. charm,refine,battle armor, summon and seal rebate.

At some point in this game, you'll have to grind for months stacking these items to be able to take full advantage of the rebates.

5.Activity lucky bag

it's a good event if you just started the game like last week,but meh otherwise.

Bad events

1.Lucky *

it's just a bad event. pretty much any event that offers you items with less value than what you're spending is bad.

2.Sakura's gift

not as bad as lucky * ,but still bad in terms of value unless you get rank one,but you can get way more off other events by spending that 20k+ ingots you spent to get rank one.(kohona great tree for example)

3. Konoha outlet

the event is between bad and mediocre.there is no discount on any of the items you purchase and scratchers just gonna get you some meh stuff unless you spend a lot which again there are better options

I'll add other events to the lists later on.