For me, I HP first, liked the process, however, I did not like the appearance of my soaps. Tried CP and have been addicted to CP ever sense. Largely, due to the appearance of my soaps. One of the difference that I know of is with HP you are basically cooking your ingredients and it is partically ready for immediate use, CP as I have been told is ready for immediate use if you do the CPOP, which is my method of choice. As for me, I normally don't use my soaps (CPOP) until a week or two later. HTH BTW, I am no expert so I am sure the more seasoned soapers will chime in.