When comparing Helios4 vs esp32, the Slant community recommends Helios4 for most people. In the question“What are the best single-board computers?” Helios4 is ranked 38th while esp32 is ranked 45th. The most important reason people chose Helios4 is:
Has four SATA 3.0 ports so it can handle up to 48TB of storage (12TB on each SATA port).
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Pros
Pro 4 X SATA 3.0
Has four SATA 3.0 ports so it can handle up to 48TB of storage (12TB on each SATA port).
Pro Many variants available
Many different variants are available depending how good you are at soldering or how small it needs to be.
Pro Very small
Can fit inside small devices.
Pro Very cheap
Without case can be below $5.
Pro Has ultra-low power mode
Pro Has bluetooth and wifi modules
Cons
Con The project fall down
Con No battery or UPS
A PC tailored for NAS usage should have a battery or UPS to prevent data corruption after a power loss. A tiny battery to safely shut it down would be enough.
Con Company shut down business!
See their website-shop.
Con Expensive
After the preorder It is expensive now.
Con Some variants require soldering
Not all variants include easily plugable pins. Usually only the more expensive variants include these.