What are the better points of Illaoi compare to Darius?

much better split pusher, more likely to win vs multiple people by herself

Darius is far superior in teamfights but if he's denied passive or Q heals he usually dies quick

Illaoi can teamfight better. Also she has slightly better waveclear I think.

You have more burst in teamfights, also it doesn't take you 5 seconds to set up stacks.

hentai

Well she has boobs, so.

Darius is strictly a better illaoi. Don't get me wrong illaoi has some serious insta burst. BUT! Darius takes 3ish seconds to start insta-killing everyone. With illaoi you have 0 stick they can walk away from you easily. Darius has stick, and against mobile champs it's just better. Darius also has a much more dominate landing phase. Illaoi has no way to start a fight which means against any have decent player it's hard for her to get a solo kill. Darius has a better time against safe-playing people. Darius also scales Better he offers more damage and is tankier. He can out-dmg an illaoi with 3 dmg items when Darius only has black-cleaver. Darius all in all is strictly better. (Now I will admit illaoi is slightly less vulnerable to 3 mans top)

P.S. - sorry for all the typos I kinda just typed this out really quickly. ( I am currently #5 Darius NA so I can assure you I know what I'm saying)

I also offer coaching especially for top! Add me if you're interested!