I'm not positive, maybe Standard 365? I have used gobs of Bmix 10 and Laguna 900 and have had great luck with both, but this past winter I got a bug in my bonnet that I needed to change to ^6 so I have tried a few different clays. The porcelain was just more persnickety than the other clays I've tried. The good things about the porcelain was it dried super fast and could be trimmed soon. That was also a negative if the clay was working on a different schedule than me. Handles required more attention to attach without cracking and I discovered i didn't need the things that porcelain excels at. I am not throwing super thin and I don't need bright white.
So I have cracked open a bag of Bmix5 which so far so good. I had left Laguana for Standard because of the QC of Laguna (chunks of odd stuff in the clay) but I'm giving it another chance. I've just decided that as a casual potter I don't need to use the high test of porcelain.