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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.
I use Google Reader to follow thousands of RSS feeds every day, and rely heavily on these two apps to do that on the tablet.
gReader Pro for Android left vs. Reeder for iPad on the right
Reeder is much more visually appealing of the two and operates more smoothly than the Android app.