When I first got into knives a few years ago, I believed 50/50 blades were the best. Now, I either carry plain edge or fully serrated. Mostly, I carry plain edge though.
In reference to your question on knife laws in Georgia, there is little reference to knives in Georgia State Law. Georgia Code 16-11-126 refers to the carrying on concealed knives and other weapons. Knives are lumped in with metal knuckles, bludgeons,etc. The key phrase in this law is"a knife designed for the purpose of offense or defense." This, of course is vague and open to various interpretations. However, Georgia has a Concealed Carry Law that allows you to carry various weapons concealed, including knives.
The length of a knife is mentioned in Georgia Code 16-11-106. this is possession of gun or knife during commission of crime. The length mentioned is 3 inches or more. This, however means nothing to law abiding citizens.
My advice as a LEO is to get a CCW and carry whatever you want, serrated,plain, or 50/50!!