I consider Luminae to be a speciality because it’s not open access. On a ship (as opposed to land) to me speciality means there is a restriction be it payment, room type etc which limits useage. I don’t think the frequency of menu changes defines a speciality particularly given the range of daily items in place say in Aqualina (fish of the day, pasta of the day, soup of the day etc).
My personal preference is the Azamara restaurants because even though the menu did change on Luminae (and by the way a lot of dishes reappeared just new names and very minor tweaks) I found the style of cooking too heavy and rich if you were to use that menu every night. I could use the Azamara speciality every night as it’s a mixture of lighter and more substantial dishes. Staff seem more able to serve you two starters rather than a starter and a main. That was a palaver in Luminae, big fuss about doing you a favour and on more than one occasion bringing the two dishes out at the same time.
Like Phil, I always stick to the menu on offer as I have seen the impact other guests ordering adaptations or from different menus has on overall service and I don’t want to do that to others. Maybe my mothers “it’s that or nothing my lady” is still ringing loud in my ears.