When comparing Radxa Rock2 vs Onion - Omega 2, the Slant community recommends Radxa Rock2 for most people. In the question“What are the best single-board computers?” Radxa Rock2 is ranked 43rd while Onion - Omega 2 is ranked 44th. The most important reason people chose Radxa Rock2 is:
Has a built-in Bluetooth module. Meaning there's no need to buy one.
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Pros
Pro Built-in Bluetooth
Has a built-in Bluetooth module. Meaning there's no need to buy one.
Pro Built-in Wifi wth antenna
Has built-in Wifi capabilities.
Pro Can dual boot Linux and Android
Other than supporting several Linux distros along with Android, you can also choose to dual-boot both.
Pro Provided with a clear plastic case
Comes with a clear plastic case included in the price, which is pretty useful for most projects people would use a SBC for..
Pro It's tiny
Pro It has lots of shields available, including Arduino shield
Cons
Con HDMI has some problems on Linux
The HDMI port has some issues on Linux, fortunately these issues are not present when using Android.
Con Not breadboard compatible
The board does not have the standard 2.54 mm pin spacing.
Con Support issues
There have been long-lasting periods were everything grew stale, even when it was about fixing security issues etc. have given up on checking since it was frustrating.
Con Expensive
It has less than 256MB of RAM.