I dont have a problem with Delta's service really. They always take care of me and compensate me when I have a problem. Cool thing about UA is channel 9, I know not a big reason to like them but its something.
I have nothing against SWA and do fly them. I just want to concentrate an airline in a big alliance with more partners and elite program. Also sadly SWA rapes you on flights from SNA and its same cost usually to fly other airlines.
Matt