Pre-6 ganking Elise vs Post-6 ganking Evelynn....
I'm not saying that Evelynn can't gank pre-6, but it's not hard to see how Elise is the stronger ganker pre-6.
So my question is, in what situation would it be worth it to sacrifice the more reliable mid / lategame winrate of Evelynn (overall Evelynn is about +5% higher winrate than Elise in Diamond+), and go for the early game ganking power of Elise? I guess my question is... assuming you can see most of the enemy team's composition before your turn to pick, what kind of enemy team composition would make you want to DEFINITELY go for early ganking power and pick Elise instead of Evelynn, and basically sacrifice Evelynns +5% higher winrate in exchange for potentially riskier early pre-6 ganking power?