The point of it is being able to play online with friends running the official version of the game on mobile or consoles. That means you need Bedrock Edition. If you don't care about multiplayer or your friends all play on computer, then you should probably use Java Edition, which is natively available on Linux anyway.

Also, Pi Edition is thirteen years old and was massively hobbled from the main production version back when it was new, so if you want a free Minecraft experience, you're better off using Luanti.