[{quoted}](name=Excessive Punch,realm=NA,application-id=3ErqAdtq,discussion-id=dm8aQWEr,comment-id=00000000,timestamp=2015-02-09T21:19:30.950+0000)
ooo so it's better to not use it against a darius or a riven eh?
darius and riven will probably kill you regardless of which W you use. against riven I would recommend the damage W and building very tanky. Against Darius I would recommend a BotRK and some armor and using the lifesteal W.
Granted, if you're good at Aatrox you will toggle between the two in a fight to get the most out of the under 50% passive. I just use lifesteal if I'm worried about losing a sustained battle and I use damage if I want to win the fight quickly because I'm afraid my target will escape.