The Ogres battalion is generally considered to be the best of the bunch in terms of usability, price and price/point on the table.
Dawrves and Bretonnians also have solid battalions which won't give you any useless models even if you buy two or three boxes.
Dwarves are the easiest army in the game to play (point and shoot, pointing optional), Ogres are pretty damned easy to use too if you stick to the standard builds. Brets much, much harder.
People disagree about the worst Battalions, though Tomb Kings, Empire and Warriors of Chaos are often mentioned.
Why? Are you thinking of starting Fantasy?
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Sisters of Battle - The Order of Glory Undimmed - 2'500 Points | High Elves - House Cyredeth - 2'500 Points | Bretonnians - The Muster of Sir Jules Estelle - 3'000 Points
Last edited by Azezel; 12-08-12 at 05:01 PM.