I feel like Zed has the most balanced splitpushing in the game
Any champion that can effectively 1v1 zed will nullify his chances of splitpushing properly because if he can't 1v1 a fiora,yi,warwick,tryn,malphite etc then he certainly can't handle a 2v1
Any champions that can escape his all in easily force him to recall such as malphite,hecarim,gragas,tryn,yi,zac etc
when zed splits he has to constantly be aware of when someone stronger than him is not on the map, he also has to go to bot/top constantly and push those out because unlike tryndamere or jax he can't just push in 1 lane forever until he gets to the point where he can't be beaten 1v1.
And no, I don't care that a zed nuked your full MR malphite and destroyed your nexus.