What is wrong with UA & AA?
The airline you fly most or an airline of the country you live is the best ffp for many people. If you buy business/first ffp's have less meaning

USA based airline ffp's tend to be more generous (status benefits/earn/burn/upgrades/award cost/award cash surcharges/expiry/affiliated credit cards/promotions) compared to non USA based airline ffp’s (even after the recently announced changes to some USA ffp’s)

With the majority of ffp's benefits are reducing and ff mile costs are going up. Upgrades are now harder to get.

Look here
- AwardAce: Compare Award Redemptions Across Airlines In Seconds -->http://www.awardace.com/
- Economical Excursionist's Tools to compare Frequent Flyer Mile Redemptions --> http://www.flyermiler.com/

The grass in not always greener on the other side