"Education is important, but big biceps are importanter" is not wrong because "importanter" is not a word, there also needs to be a period and education needs to be capitalized. Grammar win: Education is important, but big biceps are more important.
Long live the Oxford Comma! I agree!/ No, I disagree completely. If you had toast and orange juice, you don't put a comma after the toast. You use the "and" instead of the comma. I had no idea that commas had names