Somehow the grass always seems greener on the other side of the fence.

I have absolutely no complaints about CO. The past five years I have about equally split may flying between CO and UA - about 30,000-40,000 mile a year on each. In my mind, CO is better, and because of that they are getting the majority of my business this year. My upgrade percentage on UA the past five years is about 50% (as a premier) and about 60% last year. Last year on CO my upgrade percentage was 100% (as a silver elite). So far this year still at 100% (4 for 4). However, the main difference for me is the attitude of the people. CO people seem to be quite happy to be working for CO. UA personnel always seem to be in various states of unhappiness. Who could blame them considering all of the various labor problems they have expeienced lately. I think I will stick with CO for the time being.