On my WBBB i use the webbing and buckles... for this setup i use a carabiner because i don't have to disconnect the webbing from the hammock.
on my diy hammock i use whoopies and a marlin spike hitch. because the webbing isn't connected to the hammock i just thread it through the sewn eye rather than use a carabiner.
its all about the convenience. the 2-3 extra ounces never really bugged me.
I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I have not lived.
-Henry David Thoreau