I get a higher percentage of upgrades with DL, but CO has a better FC product (real food). Lounge availability is better with CO because of Star.

I'm bummed out I am losing CO Plat for 2011 but my flying can only sustain one at the moment and DL has more flights for me. If they would improve the lounges and throw some food out once in a while that would be nice.

But like you I spend so much time on RJ's it becomes a mute point. And that stinks.......real BAD

Good luck with CO, they have treated me well.