When comparing Radxa Rock2 vs Banana Pi, 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 Banana Pi is ranked 48th. 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 Official support for multiple Desktop-version Linux distros
Banana Pi officially supports Fedora, Arch, Lubuntu and openSUSE. It also can be used with Raspbian (Debian derivative) or Android.
Pro Additional keys for booting or shutting down
Pro SATA port
Pro Excellent compatibility with Raspberry Pi software
Other than having a port of Raspbian (the official OS for Raspberry Pi) available for use with full capabilities, Banana Pi can also use many applications that were originally written for Raspberry. One of these is WiringPi, a C/C++ library which gives easy access to Raspberry's I/O with a strong Arduino flavor. But that is just one example of the many open source projects being ported to Banana Pi.
Pro Onboard Wi-Fi
Most models have an onboard Wi-Fi.
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 Bad software support
Con No off-the-shelf camera modules
The A20 chip that the Banana Pi uses lacks a true Camera Serial Interface implementation, instead it uses a parallel camera interface. The problem with this is that there are no off-the-shelf camera modules that support this and can connect to the Banana Pi, but it should be mentioned that the makers of Banana Pi have promised to create a camera module that is supported by it.
Con Does not fit most Raspberry Pi cases, even though it's where it clearly has gotten the inspiration from
The Banana Pi is pretty noticeable a Rapberry Pi lookalike and the name does not hide this information either. Unfortunately it's a bit larger than the Raspberry Pi, making it very hard to fit into most Raspberry Pi cases.