CX scheme is good but quirky. Depending on how you fly and use miles it can be quite good or quite bad. Highly variable on your circumstances. Asiamiles are harder to earn than other miles (so 1 Asiamile is worth more than 1 AAdvantage mile or QFF mile, etc.). You can't compare award cost directly because of this, you have to work out what you would earn in a year on the various plans and then see what you can redeem for that earned amount. CX is particularly good if you want to get upgrades on CX (I haven't joined CX's plans for precisely this reason, I never want to get upgrades on CX as I purchase the class that I want to fly).