The only way to make skaven any good, makes them a total nightmare to play agenst. It is by far the most hated army in the game next to deamons.
I play them both, because I hate the people i play.
5+ ratling guns, 2 warp cannons, 20 jezz, 4 warp engeneers = no fun for anyone to play.
High elfs if you like a quality tactical win.
Skaven if you like making the other player quick early.