I use the Dyneema straps and Beckett hitch. I’ve got one 8ft UHMWPE and one 13ft Spider strap (I wouldn’t have ordered a strap that long, they just sent me what was left on the roll). They weigh 1.5oz together. I’ve never had a problem with the knot slipping, but as someone else mentioned, they do roll up. Takes just a few seconds to smooth it back out at the tree end. Painless.
To untie it in the morning, I have a small zing it continuous loop larksheaded to the continuous loop of my hammock. It makes untying the Beckett hitch as easy as untying my shoes. If I don’t use that loop, it can be pretty tough to undo.
The beetle buckles look really cool! I tried whoopies for awhile, with a MSH, but I just prefer the simplicity of a single strap.