Tell us what lvl do you have and also how many cupons did you saved at this moment. If you are under lvl 80 naruto sage will be a good choice if you also have a gaara, iruka, killer B or gaara the kazekage. If you buy him in sage treasure is around 5k cupons but minato is like 15k. Also you can get fragments for him in events to be even cheaper when you buy him in sage. For example there are fragments to be reedem with points in sakura's gift event. Good luck ^/_\^