Hi! Each treasure has its own benefit and it really depends on what you want to use yourself for the future. Usually, what is recommended is to find a future build that you would like and then focus on getting them.

The most popular treasure at the moment is Great Ninja War Treasure, as it gives you a great selection of ninjas.

Best tip is to always save your Seal Scrolls for a rebate as it will allow you to earn more for spending your Seal Scrolls. Events like Recruitment Feedback and Limited Recruitment gives Seal Scrolls back for using Seal Scrolls during the event. The more popular of the two events is "Recruitment Feedback"; the best rebate is to save 264 Seal Scrolls to use during the event. The rebate will allow you to hit the 300 Seal Scroll Rebate tier, giving you a total rebate of 66 Seal Scrolls.

ty very much