Wits end vs Bork - Which should I take on Devour Warwick?

Both?

I think devourer bork into full tank after is the most practical otherwise you are to squishy

Both

Go for both, its kinda hard since you will be squishy, but if you go trought you will be pretty much unkillable, passive lifesteal+bork+wit debuff will give you a nice edge in any 1vs1 which is what ww is made for.

Depends if the enemy team has a lot of AP, or if the enemy AP is fed. I like Wits though.

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I'm not going to build a lot of AD on Warwick but I was wondering which was better?

Both, with priority on Blade of the Ruined King. If you're doing well get Wit's End right after BotRK.