I like the Hennessy Hex; it's kept me dry in everything from "morning dew" to "Nairobi monsoon season" in terms of precipitation.
That being said, it really depends on what kind of camping you do. Do you want a place where you can hang out with friends during downpours and cook food under or do you just want a tarp that keeps you dry while you sleep?
If it's the former, then the hex is probably a better bet. If it's the latter, then the diamond tarp will do you just fine and be lighter, to boot.
Hope it helps!