That's pretty much what my group fell on when we looked at alignment. Maximally pro-social vs maximally self-serving. Moustache twiddling evil isn't really a thing so it makes fleshing out an evil character much easier when their motivation is more than "murder is fun".
Seems like it's good/evil up to down, law/chaos left to right, but working to ditch the baggage of the terms. I like it.
I am favorable to selfish vs selfless for evil vs good
That's pretty much what my group fell on when we looked at alignment. Maximally pro-social vs maximally self-serving. Moustache twiddling evil isn't really a thing so it makes fleshing out an evil character much easier when their motivation is more than "murder is fun".