4:3 monitor with the same diagonal size will have more pixels than a widescreen monitor. 16:10 has roughly 17% less pixels, and 16:9 about 25% less.
4:3 is still better for productivity suites, specially in larger sizes. In addition, high-quality screens are not usually available in widescreen (S-IPS) unless you pay a lot. The Dell 2007FP is an example of a high-quality monitor for Photshop, for example, at a reasonable price, and with more real estate than even a 22" 1680x monitor, and far ahead of 1440x monitors in similar sizes.