My first hammock was the hennessy, and I dutifully mastered the "figure-8 lashing" and used it on subsequent hammocks. My issue with the fig-8 was how time-consuming it was and a bore to untie when I needed to readjust. With the right rope, I found success with a slippery larks head and that worked for a year of hammocking. It was easy to tie and untie and I could adjust everything much faster. Then I discovered whoopie slings and I've never looked back.
Not only are whoopies extremely adjustable, they are so light and simple.