1. 어쨌든 and 아무튼 have the exact same meaning, so we use them interchangeably. ex) 너가 뭐라고 하든 아무튼 나는 거기에 안 갈거야.= 너가 뭐라고 하든 어쨌든 나는 거기에 안 갈거야. No matter what you say, I won't go there. 파란색이었나, 빨간색이었나, 아무튼 동그라미였어.= 파란색이었나, 빨간색이었나, 어쨌든 동그라미였어. I don't remember if it was blue, or red, anyway it was a circle. Was it blue, or red? anyway it was a circle. ----> You can use these if you want to get back to the point regadless of what you said or thought previously. 2. 좌우간 has the same meaning to above but it's a kind of word who seniors usually use rather than young peopel in a daily life. And you can find this word in novels or formal articles.