I have 2MM Amex points which I can convert into 1MM airline miles on a bunch of airlines. I'm debating between Thai, Singapore and Cathay and would appreciate advice on which is better. Mostly interested in which mileage program is best in terms of a) using miles, b) getting award travel for the least number of points, and c) which airline offers the best UG program. I am not so interested in who has the better route system or who has the better hard or soft product. Mostly I want to know where I get the best bang for my buck on the miles.