Better for Linux? I’m not sure I would say it is. Better for the world in general? When you compare things like power consumption, you can definitely see that in some use cases (the average user), ARM is superior. But for Linux? Maybe by default owing to the fact that it’s more modern. As for RISC-V, the core is open source and “all” the extensions are proprietary, so it’s not as open source as it pretends to be. But it’s definitely better than what we’re currently accustomed to as mainstream.