Unless you boxed your Wii U away, I wouldn't. Ex. I have BoTW for both systems (only because I happened to stumble across the special edition), and it looks and plays the same to me. I also don't want to slog through the game again, and the saves don't transfer over, so I probably won't play it that much TBH.
MK 8 wouldn't be as grind-y, but I would rather spend money elsewhere; the Switch version adds a couple modes and has the DLC baked in, but been there, done that for the most part for me.
Now, if they released Smash for the Switch, I don't have that yet, just the 3DS version.