When comparing Udoo x86 vs Banana Pi M3, the Slant community recommends Udoo x86 for most people. In the question“What are the best single-board computers for building a NAS system?” Udoo x86 is ranked 10th while Banana Pi M3 is ranked 13th. The most important reason people chose Udoo x86 is:
This board has a SATA III connector to allow the use of a hard drive or SSD (although a hard drive may need external power).
Specs
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Pros
Pro SATA III (x1)
This board has a SATA III connector to allow the use of a hard drive or SSD (although a hard drive may need external power).
Pro x86
You don't need to use a custom operating system.
Pro Gigabit Ethernet
Pro Up to 8GB RAM
Pro USB3
3 USB 3 ports.
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 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.
Cons
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 Expensive
It costs $129.99.