I've purchased 3 different trial sets(1,3,5) and 3 was the best choice for me.

The cleanser is sold at $10 to begin with so it was getting the additional ones to try it out.

I think they are all worth trying for $10 yourself. However, it is written as 'not for sale' in Korean in the back for the most of the product(all but face mask and cleanser) for those you are considering gifting it to someone else.