Read this on a Betting blog, thought it was interesting
Sharp vs. Square Sportsbooks
Sharp Sportsbooks:
We consider a sportsbook sharp if it:
Is a market-setting sportsbook or one that originates its own lines
Moves its lines quickly when the market gets steamed or takes a big bet
Welcomes professional action
Because sharp sportsbooks accept professional action and the highest limits, they do not shade their lines off the market. In order to maximize value by shopping for the best line, we recommend sports investors have at least one account at a sharp sportsbook. Examples of Sharp Sportsbooks:
CRIS (Bookmaker)
Pinnacle
Greek (Olympic)
5Dimes
Heritage
Carib
ABC (Jazz)
Grande
Square Sportsbooks
We consider a sportsbook square if it:
Waits for sharp books to open, then follows their lines
Does not move lines until the sharp books move
Caters to square, public bettors who like betting favorites and overs ( my favorite part of the article. The "no juice if you win" guys will certinly disagree with this)
Shade their lines towards public favorites, providing extra value for those willing to Bet Against the Public
In order to shop for the best line, its very important to also have an account at a square sportsbook. This allows value-minded sports investors to improve their winning percentage and units won by consistently getting down at better numbers. Examples of Square Sportsbooks: