Who would win slender man vs Jason?

Slender man simply because he is an entity.

Neither alive nor dead. Jeff is an insane wicked twisted evil human

but he is still alive and can die. But slender wouldn't really find

Jeff an appealing victim as he prefers children or the slightly

unhinged. Jeff wouldn't be susceptible to slender's mind games but

the sheer power of an entity who can teleport, use procsy mind

control, extend his limbs to impossible lengths and use

tendrils/tentacles that can out mach any blade in sharpness, is

irresistible. Jeff no matter how skilled or insane would be

physically over whelmed. And if he DID injure slender, then slender

would become enraged. A state in which he becomes faster more

violent and him horrible horrendous mouth opens up to consume

souls! Jeff is cool but slender is out of his league