They are equal in construction, which is why the specs aren't much different.
The difference is in the surface feel.
And, as you might suspect from the description, the extra firm is stiffer than the luxury firm.
The best reasons for going with the extra firm are:
1) Heavier body weight to support
2) A disc problem in the back that is on the severe side
The upholstery in the mattress is memory and poly foams.
Either retain their shape and initial comfort for long.
My recommendation, with countless numbers sold over that past decade, has resulted in zero complaints.
Start with the luxury firm Santorini.
Add to that, an Ever Eden 2" soft Talalay latex topper.
Latex is far more resilient than memory or poly foam.
The latex will absorb much of your body weight and cause the mattress to last a lot longer.
Also, latex sleeps cool and insulates you from the memory foam, which sleeps hot.
Latex Mattress Topper
Together, they provide an excellent night's sleep that you'll enjoy night after night for many years.
The latex topper is the key...relieving pressure points and relaxing muscles for a depth of sleep that readies you for whatever the day has in store for you.
The individually pocketed coils provide the firm contouring support needed to maintain the natural alignment of your spine.
Delivery is free and there's no sales tax.
An Important Note:
Any kind of moisture, be it from spills, accidents or perspiration causes a mattress to wear prematurely.
Protect your investment with high quality, Waterproof Mattress and Pillow Protectors that sleep cool and won't shrink.
Factory Direct to You....All Items Made Factory Fresh to Fill Your Order
Free Delivery Nationwide....US & Canada...NO SALES TAX.