If you are f2p you just wait for what superrare you get from the treasure and you buy with points the other one. Takes 16 months in average. But if you are f2p your only way to piece crab was time limited shop where is almost impossibile for you to gather the points needed with stamina only consider you get 3 fragments at most per month. So which one for you is better that is there in lucky board? The summon you will eventually get within 6-7-8 months or the summon you will never have hopes to get without paying if was not there?