Looking for an honest New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT vs Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB 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 (61/100 vs 60/100) — this is a genuine toss-up that hinges on which specs matter most for your use case. On price the New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT undercuts the Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB by 44% ($44.99 vs $64.99), which materially changes the value calculus for budget-conscious buyers.
Prices may vary · We may earn a commission on purchases. Learn more
New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT and Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB are closely matched running shoes devices with nearly identical overall scores (61 vs 60). The best choice depends on which specific features matter most to you.
New Balance
$45
Nike
$65
Scores are relative within the running shoescategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
✓ Pros
✓ Pros
✗ Cons
| Spec | New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT | Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB |
|---|---|---|
| Price | 44.99$✓ | 64.99$ |
| Weight | 350g | 310g✓ |
| Colors | Grey, White | Black, White, Smoke Grey |
Buy New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT if…
The New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
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.
New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT and Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB are closely matched running shoes devices with nearly identical overall scores (61 vs 60). The best choice depends on which specific features matter most to you.
Both products score similarly — it depends on your priorities.
New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT is cheaper at $44.99 vs $64.99 for the Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB.
The New Balance 515 Grey White Running Shoes Sneakers Men's Size 12 ML515WHT is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
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.
Nike Men's Flex 2021 RN Running Shoes Black White Smoke Grey Size 9.5 NIB is lighter at 310g vs 350g.
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.