Best Firm Mattress - Expert Recommendation to Choose

I researched about the best firm mattress for the past few days because I need one for better back support and comfortable sleep. I read reviews on The New York Times (Wirecutter), Consumer Reports, and Popular Mechanics, and they are marking these two as best:

Cool Gel Chill 14 Inch Medium Firm Memory Foam Mattress

https://www.amazon.com/COOL-GEL-Mattress-CertiPUR-US-Certified/dp/B07BV29J5N

Nectar Classic 12” Queen Mattress - Medium Firm - Memory Foam

https://www.amazon.com/Nectar-Classic-Queen-Mattress-Version/dp/B0DCXFXGBM

However, I am having trouble deciding which one would best suit my needs and need your expert advice.

In my home, I prefer a mattress that offers strong lumbar support, keeps the spine aligned, and doesn’t sink too much. I also want something durable, comfortable for long-term use, and suitable for back or stomach sleeping. Sometimes I also face mild back pain, so firmness and overall support matter a lot for me.

So which one should I buy? Any recommendation will be appreciated.
Thanks in advance.

Don’t believe Amazon reviews. They’re fake. They pay people to write good reviews. If you don’t get any feedback on this forum, I suggest you go to a mattress store in person and try out these two mattresses and ask the salesperson which one they recommend you.

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