I have checked out Yamasaki's site several times over the years and it is very cool. The other site seems very pro. and they seem to have their shit together out there, but if I had a chance to train with Yamasaki that is where I would be. As far as instruction goes you can not beat his style bro. You will make you own decision soon, but Yamasaki is where I would DEFINETLY be. You will see when you go check both of them out, there is a big difference in knowledge and instruction ability. Also, the level of competition at Yamasaki's will drive you to improve very quickly, by that I mean he will have several purple belts, blue belts, and some black belts. The more good guys there are at the school the better chance you have of people working with you one on one. Which means the better chance you have at improving. Good luck!