Any hammock website is going to steer you towards a hammock!
I use both hammocks and tents. There are pros and cons of each.
For my thru hike I decided to use a tent. I figured that since whatever shelter I went with would basically be my home for 6 months (I hate sleeping in shelters) I'd go with one that provided a lot of usable space.
A hammock is basically a big bivy sack that hangs between two trees. There isn't a whole lot of usable room inside when compared to a tent.
Hammocks take me longer to set up and the weight of hammock, rope/webbing, tarp, guyline for tarp, underquilt etc negates any benefit.
I can't say I was ever uncomfortable sleeping on the ground in the tent.
So..for me, the arguement that hammocks are more comfortable doesn't hold true. The arguement that hammocks are lighter isn't true and the arguement that hammocks are easier/faster to set up isn't true. I used a tent that weighed 26 ounces and set up in about a minute, offered room for myself and all of my gear to be spread out. I could cook inside the tent, change clothes, sit up etc.
I'll still use hammocks from time to time but for long distance trips I like the roominess and weight of a tent.
http://lightheartgear.com/lighthearttent1.html