Should I run 64-bit vs 32-bit PowerShell on Windows OS 64bit?

1. it matters is when PowerShell needs to talk to or use something outside itself. When that happens, the versions have to match.

2. if you are running 32-bit PowerShell and you try to use a module that calls a 64-bit .dll, it will fail. Or if you are running 64-bit PowerShell and you try to create a 32-bit COM object, it will fail

How to detect which Bit is available:

See here|