I know its a loose and hard question to really answer, but I am asking anyway. I am interested in getting back to warhammer and those 2 are the biggest interests. I formally played Dwarfs and Beasts of Chaos (some others too, but these two the most heaviest) so I have NO clue how to play a horde of models rushing/slumbering forth.

My question is, how are their playstyles and the differences in them? Also if you could please compare them to other armies. I used to play: HE, Bretts, Empire, Chaos, BoC, Dwarfs, and LM. As you can see I've played some different types of armies so if Skaven or VC compare to another please let me know.