I heard the (v)Wii VC would be the best ones, since Nintendo poured a lot of effort into them, tailoring each of them to the game. So if a N64 game is available as Wii VC that should give the best experience. But due to the nature of the emulator being tailed to the game, I don't think you can do injects as easily there. Also sadly there is no legal way any more to obtain them, except buying a used Wii, which has them.
On the Wii U VC they became more lazy, make because of more resources to waste and because they made a generic emulator. Also it has this dark filter
On the Wii U VC they became more lazy, make because of more resources to waste and because they made a generic emulator. Also it has this dark filter