I have used both. They both work AMAZING, not gunna lie. Chi def is easier to find but I personally have the SEDU and my cousin has the CHI. both can be purchased onlineand The reason i like the sedu is because its a bigger plate which allows me to get more hair straightened at once and hte CHI is much smaller but works just as great. Really just depends on which plate you like better a larger flat one or a shorter flat ;] good luck