Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iSeries NXG 3500 Hybrid
Beautyrest Black
Comfort
Not lab tested
9.1/10
Support
Not lab tested
9.3/10
Cooling
Not lab tested
9/10
Edge Support
Not lab tested
9.4/10
Motion Isolation
Not lab tested
8.7/10
Durability
Not lab tested
9.2/10
Value
8/10
8.4/10
Blank cells mean that model has not completed our instrumented lab protocol, so we publish no measured score for it. We never estimate a number we have not recorded.
Quick Specs Comparison
Spec
Serta iSeries NXG 3500 Hybrid
Beautyrest Black
Price (Queen)
$2,599
$2,199
Type
Hybrid
Hybrid
Firmness
6.5/10
6.5/10
Height
Varies by comfort level
14 inches
Trial
120 nights
100 nights
Warranty
10 years
10 years
Shipping
Free shipping
Free white glove delivery
Key Advantages
Why Choose Serta iSeries NXG 3500 Hybrid
- Micro coil layer boosts pressure relief without killing support
- CoolFeel Plus is Serta's strongest cooling package
- Split-head queen and king sizes available
Why Choose Beautyrest Black
- Exceptional build quality
- Advanced T3 Pocketed Coil system
- BlackICE cooling technology