What top laner is similar to jax but more difficult?

Irelia I think. Maybe Fiora.

Yasuo. I consider him similar in that he builds 2 or three items and hits a massive powerspike after which hes pretty strong for the remainder of the game, similar to jax, only with less scalability/survivability, depending on how you build.

Try courage of the colossus on him with a bruiser build.

/

Irelia Fiora maybe Riven if you wanna become toxic.

fiora

Aatrox. AoE stun (kind of), relies on attack speed, hits like a truck every few auto attacks, hard to kill (has 2 lives).