Some Videos on YouTube are showing Nintendo Switch with Lakka and several Games running pretty well in my opinion.Lakka and android are on par when it comes to dolphin performance... Don't get your hopes up, you will mostly use dolphin's "frameskip" to get somewhat playable performance. Switch isn't powerful enough to handle gc/wii emulation. That being said, if you want just emulation, go for lakka (no need to format/partition sd card, just drag and drop). If want not only emulation, well, go for android... it doesn't need any explanation. You can try both as well...
And the thing about "just copy to sd and run lakka" if this would as easy as you can tell.. i tried it and i failed. I hope, if i can efford an samsung evo plus micro sdxc, it will help a lot.