No difference between green and blue, and no difference between Pagulayan chalk and TaomGot given a few pieces of blue and it plays alright. I found it to be quite soft in the beginning, and was worried I would get through it quickly, but as I got down to the wrapper, it's become a bit more resilient. Used it for 3/4 months now, and it will easily last me a year or longer at this rate (and I play a couple hours a day). Applies well, clean and I actually like the shorter sized square.
Any noticeable difference between green and blue?