We are working on a comparison table so you can compare the benefits of each (at least for Lufthansa, United and Air Canada to start). You cannot just base it on the points you receive. There are other benefits to consider (e.g. free lounge access with Air Canada and Lufthansa--maybe others whereas you have to pay for United's Red Carpet Club membership). Also, your travel patterns probably dictate which airline to develop a close relationship with. If you travel exclusively in the US and claim your rewards for United travel, it doesn't make much sense to claim your points on Thai--one reason is that there are no blackout periods for reward travel on United planes if you become 1K with United but that wouldn't? necessarily apply to trying to get a reward on Thai if you are 1K with United. If your travel patterns are complex, then the decision becomes even harder. There are some posts on these threads that have started the comparisons but we are now trying to compile in a larger chart. If you are interested in the preliminary chart, e-mail me (it is now in Word 6.0 but can be converted to other formats).