When comparing Rock64 vs Helios4, the Slant community recommends Rock64 for most people. In the question“What are the best single-board computers?” Rock64 is ranked 10th while Helios4 is ranked 33rd.
Ranked in these QuestionsQuestion Ranking
Pro USB 3 Bus support
Pro Beats Raspberry Pi on price and performance
Pro Can have up to 4gb of low power RAM
Pro Gigabyte ethernet
Pro 4K/60h hdmi 2a
Pro Barrel power connector
More rugged connection. Less likely to be damaged.
Pro Extra Gpio pins
Pro Main header Pi 3 pin layout
Can use Pi shields.
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).
Con Lack of support, Unstable USB 3,
Only Android with TV UI is available. It is almost unusable with a touchscreen display.
Community is somewhat helpful but is very small. The board developers do not participate in community discussions. No regular Android build available. Lack of accessories and project guidelines.
Con Power connector is not MicroUSB or MiniUSB
Can't use power banks as a power source because of that.
Con No on-board Wi-Fi or Bluetooth
Con Lack of accessories
It is expensive now.
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.