Banjo,
This is a light gear oriented group, tarp, tent or hammock, we only care about the total weight. A hammock system will weigh more than your tarp. Do you like to sleep in hammocks? That's the bottom line. If you go to the hammock forum you will meet many people who will tell you that they are better than people who sleep on the ground. That it hurts their back to crawl into a tent and sleep on a thin pad. They have so many reasons for being gung ho about hammocks, we basically don't care. Beside whether or not you are more comfortable sleeping in a hammock (I am not), there are other issues to drive you up, like lava rock or lack of flat places to pitch a tent, that don't have brush or trees (or rocks).
You used the word "best" then you mentioned cost and durability and weight, so which is it? You didn't even ask about comfort.
Jim