I use the 4 blade regular Stinger (non-buzz). I have killed with both. Based on Ol School advice about a ultra sharp clean cut ( like when you cut yourself shaving) not giving the blood platlets something to cling to, the non-buzz will deny platlets a cling, so the animal is more likely to continue bleeding.
A jagged cut is rough, and blood platlets immediately cling & begin stopping the bleeding. So, with that, the buzz cut is more of a new gimmick when they came out, knowing that the average joe is sparked by something new every year, a marketing tactic used smartly by camo manuf. Get the regular stuff man.