Looking for an honest Asustor Flashstor 6 vs Synology 8 Bay NAS DiskStation ds1821 comparison in 2026? We scored both nas storage 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 (50/100 vs 53/100) — this is a genuine toss-up that hinges on which specs matter most for your use case. The widest gap is in battery life, where the Asustor Flashstor 6 pulls noticeably ahead. On price the Synology 8 Bay NAS DiskStation ds1821 undercuts the Asustor Flashstor 6 by 75% ($399 vs $699), which materially changes the value calculus for budget-conscious buyers.
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Asustor Flashstor 6 and Synology 8 Bay NAS DiskStation ds1821 are closely matched nas storage devices with nearly identical overall scores (50 vs 53). The best choice depends on which specific features matter most to you.
Asustor
$699
Scores are relative within the nas storagecategory. Percentages show each dimension's weight in the overall score. A difference of less than 0.5 points is considered a tie.
✓ Pros
✗ Cons
✓ Pros
✗ Cons
| Spec | Asustor Flashstor 6 | Synology 8 Bay NAS DiskStation ds1821 |
|---|---|---|
| Price | 699$ | 399$✓ |
| RAM | 8GB✓ | 4GB |
| OS | ADM 4.0 | DiskStation Manager (DSM) |
| Weight | 1100g✓ | 1500g |
| Dimensions | 250 x 220 x 220 mm | 166 x 243.5 x 223.5 mm |
| Colors | Black | Black |
Buy Asustor Flashstor 6 if…
The Asustor Flashstor 6 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Buy Synology 8 Bay NAS DiskStation ds1821 if…
Choose the Synology 8 Bay NAS DiskStation ds1821 if budget is your top priority — it offers competitive specs at a lower price point.
Asustor Flashstor 6 and Synology 8 Bay NAS DiskStation ds1821 are closely matched nas storage devices with nearly identical overall scores (50 vs 53). The best choice depends on which specific features matter most to you.
Both products score similarly — it depends on your priorities.
Synology 8 Bay NAS DiskStation ds1821 is cheaper at $399 vs $699 for the Asustor Flashstor 6.
The Asustor Flashstor 6 is worth considering if you prefer its specific design, ecosystem, or brand — though it scores lower overall in our comparison.
Choose the Synology 8 Bay NAS DiskStation ds1821 if budget is your top priority — it offers competitive specs at a lower price point.
Asustor Flashstor 6 is lighter at 1100g vs 1500g.
Asustor Flashstor 6 has more RAM (8GB vs 4GB), which helps with multitasking.
Reviewed by VersusMatrix Editorial Team
Last updated: June 1, 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.