The real advantage that Tails has, is that it was designed to be able to be used offline... easily. In that, it has the option right in the boot menu for booting with networking off.

You may find that running Windows "offline" causes issues with some modules as they're designed to be used in an "always on" environment... but at worst, I would expect an error message or 2... it certainly shouldn't be any showstopper issues that mean the OS is basically non-functional.