I prefer for the Transatlantic crossing a larger and newer ship. I have done many crossings on MSC, Celebrity and Royal Caribbean ships. I avoid doing that type of crossings with Azamara.
My main reason to not take Azamara for that, is exactly to avoid rough sea days on a smaller ship with limited inside entertainment. I have experienced rough days on Transatlantic crossings specially in the proximity of the Azores and approaching Lisbon.
Having said that, on my last cruise with the Pursuit, we had some rough seas which were unavoidable. This was, leaving the Beagle Channel, on the Drake Passage and on the Magellan Strait. No way the captain could avoid this because there was no other option than to go ahead. I had a midship cabin and I have felt it but it did not bother me or made me sick. The location of my cabin helped. Apparently other people felt sick.
If you are considering the crossing with Azamara, I would recommend you take a midship cabin. In that area the Captain will deviate to avoid bad weather if he can.
Ivi