Hi bedshopperHRA,
Welcome to the Mattress Forum! 
You are certainly looking at two great quality/value choices. Both of them use high quality materials and neither one has any “weak links” in the design.
Outside of the materials that they use the biggest difference between them is the options you have both before and after a purchase.
The BestMattressEver has three firmness options that you can choose before a purchase but it’s a “finished mattress” that can’t be fine tuned after a purchase (except by adding a mattress pad or topper) and it has a free 120 day return policy.
The Freedom mattress has three standard layers (generally soft medium and firm but you can request other firmnesses as well) so with the standard layer options you would have 12 different configurations that are possible with the Freedom mattress so most people would be able to find a combination that works well for them but if all else fails and if you ordered it from the Dreamfoam site then they also have a 45 day trial period where you can return it for a $99 fee.
When you are down to finalists that are all choices between “good and good” (which you are) and none of them have any weak links or lower quality materials in their design (which they don’t) and if there are no clear winners between them then you are in the fortunate position that any of them would likely be a suitable choice and post #2 here can help you make a final choice based on your local testing or mattresses you have slept well on, your more detailed conversations with each of them, your confidence about the suitability of each one, their prices, your preferences, the options you have after a purchase to change the firmness 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.
Phoenix