Cinderhulk or bloodrazor o shyvana

Shyvana is the champion that got me started. I'd hate to lose her. My success has decreased ever since bloodrazor. I figured it would be good since you have alot of on hit and now it's even more with her w. Now it seems as if I don't snowball nearly as hard unless I get a lead. If I don't, I just go even or feed. I checked out a guide and it said cinderhulk is good when paired with wits. I also heard bloodrazor is actually an indirect nerf to shyvana since she relied on sated. Guinsoos is expensive and again, you need a good lead to get it. It's even better with the ap added to her w and on hit with the w. Also bloodrazor is physical while shyvana is magic dmg. So should I go cinderhulk wits or bloodrazor spirit vissage.