Hi, you will get more points through M&M, and you would have to go onto their site and sign up and they will issue you with your number.
HOWEVER,if you live in Asia, and your desire is to use your points for upgrades and award flights, AND if your main carrier is going to be TG, you will find it easier to get upgrades on TG flights if you are a Thai frequent flyer. If your intention is to do a lot of long haul in C and F, and your choice of carrier is restricted to *A, your best bet would be M&M. regards bkkrop