Red Code is a softer string than PHT. Both are great string and has good topspin potential. Is there something you don't like about PHT that makes you want to change? If you are looking for something softer than PHT then Red Code is a good string to tryout. I also feel as though PHT is on the "lighter" side when it comes to the weight of the string then Red code. So if you are pretty meticulous about the weight of your racquet, you may feel the difference.