AA is another good one, as you can use Citi Reduced Mileage Awards (assuming you have a Citi AA card, and what FTer doesn't have a dozen of them?) and OW RTW awards. They also have about the most available redemptions.

Another to avoid would be Delta. They have promotions to get more miles sometimes, but redemption is very hit and miss (and that's being generous).

Part of the beauty of Starpoints is that you don't have to decide where to redeem them. If you find a good deal with AA, you can transfer some miles there. If you find a good deal with US, you can transfer some miles there. If you find a good deal with CX, you can transfer them there. If one of the airlines goes out of business or dilutes their FF value, you aren't locked in to just one.