Thank you all for sharing your thoughts.
I'll definitely get a ticket for the Copeland - Cornejo - Abrera performance, which by the way suits better to my working schedule.
At first I was thinking of the other performance, since Herman Cornejo will be guesting here at Teatro Colón as Conrad, alongside Kochetkova as Medora and Simkin as Ali. That will happen in ten days and I already got my tickets. But I've changed my mind.
Not sure about that. Last January I attended a performance of the NYCB. I entered the forum with the idea of posting something about that, but I found that several other members were reporting about the very same performance I attended. All of them noticed something wrong in one of those ballets, some kind of partnering misunderstanding that was even noticeable in the main ballerina's face (the ballet was Chaconne, maybe some of you read about that here in the forums). I saw nothing of that, I thought everything was fine, I didn't notice anything wrong, neither the partnering flop nor the disgusted ballerina gesture. Adding that to the fact that English is not my native language and my lack of knowledge about steps and many other things, I thought I'd rather remain just a reader.
One more time, thank you all. Really appreciate that you took your time to reply my question.