zerobasecamper163, Welcome to the forum. You will get a lot of anecdotal information here and
www.hammockforums.net. In addition, consider obtaining a copy of Derek Hansen's book, "The Ultimate Hang". It is now in its third edition. I like the first edition myself. That volume is probably pretty cheap on the Used market.
Minimizing the "What is the best?" mindset will save you some concern because your tastes and needs could change a lot in the first year.
Two common categories of hammocks are Gather End (GE) - the traditional hammock shape with the material gathering (G) and the ends (E), and a Bridge Hammock, designed for spreader bars at both ends, holding it open like an elevated cot.
Beware of cheap deals from Amazon. There are many, many low cost hammocks for sale with a physical length of around 6 to 8 feet. The norm for a "camping" GE is about 11 feet.
You don't achieve a flat lie by stringing the hammock up tight. The "flatness" comes from a slight, but definite diagonal lie with your head/shoulders on one side of the hammock center line and your feet on the other. To achieve that configuration, the hammock - talking about GE hammocks - needs some sag. That's why the recommended hang results in the hammock's end-to-end distance being about 83% of the hammock's physical length.
Another measure that achieves the same thing is to set up so that the suspension lines come off the tree (or other support) at a 30° (or 60°, depending upon where you measure) angle. An estimate of that is to make a "gun" with your thumb raised and index finger pointed. While touching the suspension with the tip of your raised vertical thumb, the line should continue to just about the tip of your index finger. There is no "hard and true" number. Each person and hammock combo will have its sweet spot. Those numbers, 83% and 30°, are "-ishes", "abouts", and "sortas". It's a place to start.
