True, however the end of soft landings will likely cull the ranks of many AA elites.

Of course the only reasonable expectation the OP can have, regardless of with whom they are flying, is that they can expect to be flying in the cabin for which they have paid. However, there is a greater probability of being upgraded on AA as one can use instruments, whereas with CX, they are by all accounts infrequent and reliant upon other factors (i.e. an oversold cabin).