As of yesterday:

Ambiance - AA much better (CX is sort of above the main area without soundproofing). Bruno's description is a good one.

Chairs - AA much better

Location - AA much better for AA gates

Access- AA much better (escalator down vs. stairs up)

Bathrooms - AA has 'em inside, CX outside

Food - CX a little better I think (choice of cereal, better fruit, ramen) but AA did bring out the tuna sandWiches (not on baguette; I didn't see CX closer to lunch )

Liquor - CX so much better it's hard to believe. Unless you don't like either wine or Martell XO!!!!! Which I love and had one even though it was 10AM (it was a going to be a long flight). Other than wine or Martell, it's just much better (JWB vs. JWR).

Bottomline, if you want to drink, stop in CX lounge otherwise don't bother

PS AA free wifi, didn't check CX

PPS Thanks to all the previous posters who helped me decide what to do.