The UltraSkins have been compared to a Kamui many times. The SIB though new to many has feedback of like an old Moori. All the types are PigSkin. The cutting on the lathe is way different as the feel of the hit is different. They do not compete with each other, more fill a gap. If as a player you like how a Kamui hits I would say give UltraSkin a try. If you liked the hit of the old Moori I would suggest you give the SIB a try.