Hi Sounders1.
Welcome to our Mattress Forum! 
With this being your first post and since you registered on The Mattress Underground (TMU) just yesterday you must a very sophisticated user to know that the “Start a new Topic Button” existed and was removed!
TMU is implementing a new design element – Talk to the Experts and while it is under construction, we have eliminated New Topics so we can effectively service consumer members and manage the increased workload demand. We are excited about how “Talk to the Experts” will improve TMU. More information will be forthcoming over the next few weeks.
We are not in a position to comment on the Aurora. Brooklyn Bedding, when it was a TMU member, did not provide TMU with the full specifications of the Aurora. I agree that speaking with both BB and Nest after the holidays, as you have noted that you plan to do, is probably the best way for your questions and concerns to get addressed.
Both are good companies and will likely support you well after your purchase.
Having a detailed conversation with them based on the information and notes you provide will very likely help you determine which of your two finalists would be the best match for you in terms of PPP((Posture and alignment, Pressure relief, and Personal preferences) and its suitability, price, your preferences for different types of materials, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
The design of the product and the density of the comfort foams would be a more significant consideration of durability than the firmness of the comfort foams.
I’m looking forward to finding out what you end up deciding after your conversation
Phoenix