Looking for an honest Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB vs RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 comparison in 2026? We scored both running shoes on the same six-dimension framework — performance, battery, display, camera, design and value — using identical methodology, so the numbers below are directly comparable. Both products score nearly identically (60/100 vs 61/100) — this is a genuine toss-up that hinges on which specs matter most for your use case. On price the RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 undercuts the Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB by 183% ($22.99 vs $64.99), which materially changes the value calculus for budget-conscious buyers.

Nike
$65
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Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB and RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 are closely matched running shoes devices with nearly identical overall scores (60 vs 61). The best choice depends on which specific features matter most to you.
✗ Cons
✓ Pros
| Spec | Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB | RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 |
|---|---|---|
| Price | 64.99$ | 22.99$✓ |
| Display Type | — | No |
| Resolution | — | No |
| Processor | — | No |
| OS | — | No |
| Bluetooth | — |
Buy Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB if…
The Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 if…
The RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB and RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 are closely matched running shoes devices with nearly identical overall scores (60 vs 61). The best choice depends on which specific features matter most to you.
Both products score similarly — it depends on your priorities.
RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 is cheaper at $22.99 vs $64.99 for the Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB.
The Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
The RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Reviewed by VersusMatrix Editorial Team
Last updated: May 21, 2026
Methodology: AI-powered analysis of technical specifications from manufacturer data. Scores are calculated by comparing products across multiple dimensions and normalized relative to the full category database. Our editorial process is independent and not influenced by affiliate partnerships.
Scores are relative within the running shoescategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
| No |
| Wi-Fi | — | No |
| Water Resistance | — | No |
| Weight | 310g | 280g✓ |
| Dimensions | — | No |
| Colors | Black, White, Smoke Grey | White, Black |
RBX Men's White Black Athletic Sneakers Lace Up Size 9.5 is lighter at 280g vs 310g.