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Evernote is the most heavily used app on both my iPad and Galaxy Tab, and this screen shows the differences in the versions on both platforms.
Android Gmail left vs. Mail iPad app right
Both apps use my Gmail account and are similar in function. The iPad Mail app looks a little more polished.
Pocket Informant is a good calendaring/task manager app for both platforms. As evidenced in the comparison screen, the iPad verson on the right has more functionaility than the Android version. The display on the iPad app is more visually appealing than the Android version on the left.