You can't really predict how a board will ride by focusing on just one element. A board's riding characteristics are derived from the entire construction of the board...aerial profile (length, width, sidecut geometry, taper), horizontal profile (various configurations of camber and rocker), flex pattern (as in stiffness AND distribution), and materials, so you need to look at it all.
Unfortunately, manufacturer descriptions are typically more focused on hype than substance, and are so woefully inadequate. "Published" online and mag reviews are even worse, being little more than manufacturer paid advertisements or store sales promotions under such rediculous guise.
To compare boards without riding them, it's difficult, but you need to seek out peer reviews and look for reoccuring themes in them. Then you need to look into actual build information (numbers) from the manufacturers to try to get a sense of how riding and construction correlates. From there, you can start to get a sense of how you can expect a board to ride. Actually RIDING different boards is of course ideal, but may or may not be realistic.