Sharper lines and better "matcap" (material capture) compatibility.
Using Aa1-hair-v3 isn't always plug-and-play. Users often encounter versioning conflicts depending on which (a community-made fix pack) they are running. Aa1-hair-v3
Dedicated servers for character creators often have "missing asset" channels where users can request the exact aa1.hair.v3 file. Aa1-hair-v3