I saved enough coupons to get this week's fuku event (110k coupons). But I kinda have to choose between getting Indra 4 star or Shisui Susanoo 4 star. I currently have 67 Shisui frags. I'm not sure how much it will cost to get the remaining 113 frags, but I'm certain it won't leave me enough to get indra 4 stars. I can buy 100 frags of Indra in the Amusemnt Park event for 100k coupons. Which ninja is the best choice here?

UPDATE: I did end up getting Indra 4 stars with full BT. and definitely the better decision. I beat several BT shisui teams in arena, both casual and ranked.