By taking two turns you will reduce chafe at a place where chafe is hard to see.
I would only use a scaffold hitch when splinting a broken limb.
A halyard hitch is almost impossible to untie at the masthead; you could get the same problem with a buntline hitch but this is what I use on my standing parrels, but I can get at these at deck level.
The simpler the better every time, bowline or round turn; just sew it in...