I am coming to VC after TK. What I like about both armies is that they are so different from each other.
I love the TK mythology because I always enjoyed the ancient egyptian theme, and I think the models are much better, the skeletons are more animated with more elaborate armour and there is the scorpion, catapult, ushabti and the tomb king models which are great. I think they are tactically more challenging and more interesting to use.
So now I am starting a VC army...Why you might ask?
Well, VC have that gothic mythology going on. I love the idea of shambling zombies and the new book has given them many more options. They are no longer a big mass of rubbish troops led by an awesome character. Now they have som really good units in their own right. I think the mannfred model is great, finally a decent vampire model! I also love the black coach and new skeleton models. I like the raw aggression of the VC army which is different to the finesse of the TK army.
I can't decide which is better. I love both their mythology for different reasons.....