If you're just looking for an SBC, there's no real need to look past the Pi, or Odroid's offerings.
RISC V is a developer's system. We may see some mainstream boards eventually, but general purpose computing isn't really their use case.
From what i understand ARM is also a RISC instruction set with some of their own proprietary framework and instructions thrown in to address issues with using RISC instruction sets. RISC-5 looks like its a completely open source instruction set. It's probably worth it to start getting into it now and putting some weight behind it so it can be a competitor with ARM and we might see some open source processor designs go to mass production.
RISC-V's big advantage is it's not a proprietary core like ARM is.
When you buy an ARM processor, you license the technology from ARM. You can do whatever you want with that core, but you're limited by both the types of cores that are available and the licensing agreement with ARM.
RISC-V is a core set that anyone can use without license. You can take as much of the core(s) as you want, depending on the power you need, without agreements or licensing.
While both of them accomplish the same goal, that of providing a high processing power with low(er) electrical power, they do it in different ways. ARM simply has the inertia here.
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