That’s a killer riff in that video. Based on the video I would go Nazgûl, then Black Winter, then Full Shred. I think these 3 have more mids that help them cut through the mix than some of the others that are very scooped, which I personally don’t really care for, although your preference may obviously vary. The Nazgûl is largely more aggressive than the rest due to more highs and quality of the distortion. I particularly like the grinding chug sound of the Nazgûl, which seems fairly unique to that pickup, and is the main reason I’ve kept my original run KM-7. AdenM may be right on the lack of bass response with the Nazgûl in ash. It does seem a little thin in the KM-7, but it gets overshadowed by the 7th string in that case. It’s been a while, but as I recall there was some versatility in the Nazgûl at lower gain, but I can’t be sure. If you really want a lot of versatility, it may not be the best choice, but again it may be hard to duplicate that particular high gain sound elsewhere. I guess it depends what’s most important to you. If still unsure, you may need to venture outside Seymour Duncan.