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Synology DS423+ — NAS · $499
Synology

Synology DS423+

NAS · $499

86
/ 100
From $499
VS
Asustor Flashstor 12 Pro wins by 2
Asustor Flashstor 12 Pro — NAS · $1099
Asustor

Asustor Flashstor 12 Pro

NAS · $1099

88
/ 100
From $1,099
Specdex verdict

Asustor Flashstor 12 Pro takes it — here’s why.

In our weighted Specdex score, Synology DS423+ lands at 86 and Asustor Flashstor 12 Pro at 88. That puts Asustor Flashstor 12 Pro ahead by 2 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Synology DS423+ if…

  • ✓Rich software ecosystem (Synology/QNAP)
  • ✓NVMe cache slots on newer models
  • ✓Docker/VM support on higher tiers

Pick Asustor Flashstor 12 Pro if…

  • ✓Rich software ecosystem (Synology/QNAP)
  • ✓NVMe cache slots on newer models
  • ✓Docker/VM support on higher tiers
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Performance

Asustor Flashstor 12 Pro

Compared on the performance sub-score

Asustor Flashstor 12 Pro leads on performance (88 vs 86).

Features

Asustor Flashstor 12 Pro

Compared on the features sub-score

Asustor Flashstor 12 Pro leads on features (88 vs 86).

Software

Asustor Flashstor 12 Pro

Compared on the software sub-score

Asustor Flashstor 12 Pro leads on software (86 vs 84).

Value for money

Synology DS423+

Specdex score per dollar at MSRP

Synology DS423+ more score per dollar ($499 vs $1,099).

Synology DS423+ 86
vs
88 Asustor Flashstor 12 Pro

Score breakdown

Synology DS423+
86
performance 86
features 86
software 84
value 82
Asustor Flashstor 12 Pro
88
performance 88
features 88
software 86
value 82

Specs side-by-side

Synology DS423+ versus Asustor Flashstor 12 Pro — full spec comparison
Spec Synology DS423+ Asustor Flashstor 12 Pro

Synology DS423+

Pros
  • +Rich software ecosystem (Synology/QNAP)
  • +NVMe cache slots on newer models
  • +Docker/VM support on higher tiers
Cons
  • −Disks rarely included
  • −Drive compatibility restrictions on some brands
  • −Power draw 24/7

Asustor Flashstor 12 Pro

Pros
  • +Rich software ecosystem (Synology/QNAP)
  • +NVMe cache slots on newer models
  • +Docker/VM support on higher tiers
Cons
  • −Disks rarely included
  • −Drive compatibility restrictions on some brands
  • −Power draw 24/7

FAQ: Synology DS423+ vs Asustor Flashstor 12 Pro

Which is better, Synology DS423+ or Asustor Flashstor 12 Pro? +

Asustor Flashstor 12 Pro scores 88 on our weighted rubric — ahead by 2. Your best pick depends on the sub-scores above.

Is Synology DS423+ worth the price? +

At $499, Synology DS423+ delivers a Specdex score of 86 — strongest in performance.

Is Asustor Flashstor 12 Pro worth the price? +

At $1,099, Asustor Flashstor 12 Pro delivers a Specdex score of 88 — strongest in performance.

Does Synology DS423+ or Asustor Flashstor 12 Pro last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for performance, Synology DS423+ or Asustor Flashstor 12 Pro? +

Asustor Flashstor 12 Pro — leads on performance (88 vs 86). Compared on the performance sub-score.

Which is better for features, Synology DS423+ or Asustor Flashstor 12 Pro? +

Asustor Flashstor 12 Pro — leads on features (88 vs 86). Compared on the features sub-score.