Definitely Daken. I actually loved his Dark Wolverine series by Way/Liu and Cammo and felt the character showed loads of potential there. Even though I prefer him as an anti-hero, I thought Remender used him well in Uncanny X-Force and his demise at the hands of his own father was beautifully poignant and well-written. I would have let him stay in the grave though for a change, he hasn't been written well at all since then.