the 22" (1680x1050) will display more info than the 19" (1440x900). some people find the 1440x900 a step backward from 1280x1024. (if you're used to 1280x1024, the 19" is wider but shorter; with the 22" it's wider and taller).

the dell may have a technically better picture, but most folks can't tell the difference between a slow panel and a fast panel or low contrast and high contrast especially with productivity apps, browsing, etc.