"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.
The Most Accurate Definition of Periods Ever. Totally worth the read. It's long and graphic, but it's so accurate. All men need to read this just so they can get a sense of what it's like to have a period.