Board Thread:Questions and Answers/@comment-211.203.21.6-20150704051606/@comment-24956068-20150704180931

I have to admit sometimes I get better results from opening one-by-one (which is, the Supreme Treasure Chest ticket) than 6+1 Set, but it's all about luck and the answer will be personally different by each person.

However, just like Akrie and Tricoro said above, 6+1 Set guarantees you 3 S-grade, so I'm recommending you to call for 6+1 Set. It will at least increases your chance of being a lucky one, while saving your Crystals. Don't forget Better Chances of Getting S-grade Treasure it increases the chance pretty significant when some people managed to get all 7 S-grade treasures.