As far as I can tell from my research, they're exactly the same. It's only better in the sense that it's fully portable. The PC version is the most complete offering as the Torque quest is available there. I supposed it's possible the Switch will get that ported over, but it's not clear at this time.
I suspect that if you've already played the Wii U version (or still intend to play it), you're fine doing that on the Wii U. No reason to grab it on the Switch.


