Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Plank Firm
Saatva Classic
Comfort
8/10
9.3/10
Support
9.5/10
9.6/10
Cooling
8.5/10
9.4/10
Edge Support
9/10
9.7/10
Motion Isolation
8.5/10
8.8/10
Durability
9.2/10
9.5/10
Value
8.8/10
8.9/10
Quick Specs Comparison
Spec
Plank Firm
Saatva Classic
Price (Queen)
$749
$1,295
Type
Hybrid
Innerspring Hybrid
Firmness
9/10
6/10
Height
11.5 inches
14.5 inches
Trial
120 nights
365 nights
Warranty
10 years
Lifetime
Shipping
Free shipping
Free white glove delivery
Key Advantages
Why Choose Plank Firm
- Flippable design - two firmness options
- Excellent for stomach sleepers
- Great spinal alignment
Why Choose Saatva Classic
- Free white glove delivery and setup
- Exceptional breathability - sleeps very cool
- Outstanding edge support for sitting
Lab Verdict
Cooling was a wash — both mattresses landed within half a degree of each other after 60 minutes of body heat. Couples should note that the Plank Firm dampened motion more aggressively (0.13g peak vs. 0.18g). The Saatva Classic relieved more shoulder pressure for side sleepers (28 mmHg vs. 38 mmHg). Perimeter compression was nearly identical — neither bed is the obvious pick on edge support alone. Combo sleepers will get more rebound from the Plank Firm (59% bounce vs. 42%).
| Metric | Plank Firm | Saatva Classic | Edge |
|---|---|---|---|
| Cooling (60-min Δ°F) | 3.5°F | 3.2°F | Saatva Classic |
| Motion isolation (g) | 0.13g | 0.18g | Tie |
| Edge sinkage | 2" | 1.9" | Saatva Classic |
| Shoulder pressure (mmHg) | 38 mmHg | 28 mmHg | Saatva Classic |
| Response time (s) | 0.5s | 0.4s | Saatva Classic |
| Off-gassing | 2 days | 0 days | Saatva Classic |
Median of 3 trials, 68°F climate-controlled lab. DH/NL / DH/KW · scoring vv2.1.