I believe that Botox injections are the easiest, safest and most consistent and predictable way to relax the muscles that crease or furrow the brow creating a tired or angry look. Often botox injections are needed even after surgical ablation of the nerves that supply these muscles as is done in a brow lift, so I would not pursue a brow lift unless your brow is truly sagging below the upper orbital bone causing heavy eyelids and droop. It is nice to consider surgical options but I am not sure when you consider all the pluses and minuses that surgery comes out ahead of simple and safe botox or dysport injections.
http://www.youtube.com/watch?v=O2ABbnU1vB8


